Surgical instrument for removing an implanted object

ABSTRACT

Methods and devices for separating an implanted object, such as a pacemaker lead, from tissue surrounding such object in a patient&#39;s vasculature system. Specifically, the tissue separating device includes a handle, an elongate sheath and a circular cutting blade that may extend from the distal end of the sheath upon actuating the handle. The elongate sheath, particularly its distal end, includes a non-uniform wall thickness having one or more thicker portions in the outer sheath, particularly the outer cam member, and/or one or more thicker portions in an inner member disposed radially inward of the blade.

CROSS REFERENCE TO RELATED APPLICATION

The present application claims the benefit of and priority, under 35U.S.C §119(e), to U.S. Provisional Application Ser. No. 61/793,597,filed Mar. 15, 2013, entitled “SURGICAL INSTRUMENT FOR REMOVING ANIMPLANTED OBJECT,” which is hereby incorporated herein by reference inits entirety for all that it teaches and for all purposes.

FIELD OF THE DISCLOSURE

The present disclosure relates generally to devices, methods and systemsfor separating tissue in a patient, and more specifically, to devicesfor separating tissue attached to implanted objects, such as leads, in apatient and removing such objects.

BACKGROUND

Surgically implanted cardiac pacing systems, such as pacemakers anddefibrillators, play an important role in the treatment of heartdisease. In the 50 years since the first pacemaker was implanted,technology has improved dramatically, and these systems have saved orimproved the quality of countless lives. Pacemakers treat slow heartrhythms by increasing the heart rate or by coordinating the heart'scontraction for some heart failure patients. Implantablecardioverter-defibrillators stop dangerous rapid heart rhythms bydelivering an electric shock.

Cardiac pacing systems typically include a timing device and a lead,which are placed inside the body of a patient. One part of the system isthe pulse generator containing electric circuits and a battery, usuallyplaced under the skin on the chest wall beneath the collarbone. Toreplace the battery, the pulse generator must be changed by a simplesurgical procedure every 5 to 10 years. Another part of the systemincludes the wires, or leads, which run between the pulse generator andthe heart. In a pacemaker, these leads allow the device to increase theheart rate by delivering small timed bursts of electric energy to makethe heart beat faster. In a defibrillator, the lead has special coils toallow the device to deliver a high-energy shock and convert potentiallydangerous rapid rhythms (ventricular tachycardia or fibrillation) backto a normal rhythm. Additionally, the leads may transmit informationabout the heart's electrical activity to the pacemaker.

For both of these functions, leads much be in contact with heart tissue.Most leads pass through a vein under the collarbone that connects to theright side of the heart (right atrium and right ventricle). In somecases, a lead is inserted through a vein and guided into a heart chamberwhere it is attached with the heart. In other instances, a lead isattached to the outside of the heart. To remain attached to the heartmuscle, most leads have a fixation mechanism, such as a small screwand/or hooks at the end.

Within a relatively short time after a lead is implanted into the body,the body's natural healing process forms scar tissue along the lead andpossibly at its tip, thereby fastening it even more securely in thepatient's body. Leads usually last longer than device batteries, soleads are simply reconnected to each new pulse generator (battery) atthe time of replacement. Although leads are designed to be implantedpermanently in the body, occasionally these leads must be removed, orextracted. Leads may be removed from patients for numerous reasons,including but not limited to, infections, lead age, and leadmalfunction.

Removal or extraction of the lead may be difficult. As mentioned above,the body's natural healing process forms scar tissue over and along thelead, and possibly at its tip, thereby encasing at least a portion ofthe lead and fastening it even more securely in the patient's body. Inaddition, the lead and/or tissue may become attached to the vasculaturewall. Both results may, therefore, increase the difficulty of removingthe leads from the patient's vasculature.

A variety of tools have been developed to make lead extraction safer andmore successful. Current lead extraction techniques include mechanicaltraction, mechanical devices, and laser devices. Mechanical traction maybe accomplished by inserting a locking stylet into the hollow portion ofthe lead and then pulling the lead to remove it. An example of such alead locking device is described and illustrated in U.S. Pat. No.6,167,315 to Coe el al., which is hereby incorporated herein byreference in its entirety for all that it teaches and for all purposes.

A mechanical device to extract leads includes a flexible tube called asheath that passes over the lead and/or the surrounding tissue. Thesheath typically may include a cutting blade, such that uponadvancement, the cutting blade and sheath cooperate to separate the scartissue from other scar tissue including the scar tissue surrounding thelead. In some cases, the cutting blade and sheath may also separate thetissue itself from the lead. Once the lead is separated from thesurrounding tissue and/or the surrounding tissue is separated from theremaining scar tissue, the lead may be inserted into a hollow lumen ofthe sheath for removal and/or be removed from the patient's vasculatureusing some other mechanical devices, such as the mechanical tractiondevice previously described in U.S. Pat. Publication No. 2008/0154293 toTaylor, which is hereby incorporated herein by reference in its entiretyfor all that it teaches and for all purposes.

Some lead extraction devices include mechanical sheaths that havetrigger mechanisms for extending the blade from the distal end of thesheath. An example of such devices and method used to extract leads isdescribed and illustrated in U.S. Pat. No. 5,651,781 to Grace, which ishereby incorporated herein by reference in its entirety for all that itteaches and for all purposes.

Controlling the extension of the blade with a patient's vasculature maybe critical, particularly when the sheath and blade negotiate tortuouspaths that exist in certain vascular or physiological environments.Furthermore, in certain cases, using such mechanical devices for leadremoval may require more precise control, such as when the leads arelocated in, and/or attached to a structurally-weak portion of thevasculature. For instance, typical leads in a human may pass through theinnominate vein, past the superior vena cava (“SVC”), and into the rightatrium of the heart. Tissue growth occurring along the SVC and otherlocations along the innominate vein may increase the risk and difficultyin extracting the leads from such locations, particularly when thevein(s)' walls are thin. Tissue growth may also occur at otherchallenging locations within a patient's vasculature which requires thedelicate and precise control of the devices used to extract leads fromsuch locations.

SUMMARY

Accordingly, there is a need for a device, method and/or system such asa surgical device that has the capability to protect the vasculaturefrom inadvertent contact from a blade during extension and rotation ofthe blade from a sheath. The present disclosure discusses a mechanismfor protecting the vasculature from such inadvertent contact. Themechanism includes an outer sheath having a non-uniform wall thicknesssuch that the distance between the blade and the exterior of the outersheath is greater at one or more portions along the circumference and/orcross section of the outer sheath in comparison to the other portion(s)of the circumference and or cross section. Increasing thecross-sectional wall thickness for one or more portions of the outersheath, particularly at the distal tip of the outer sheath, assists inshielding the vasculature from the blade during extension because theincreased wall thickness creates a greater distance between thevasculature and the blade in comparison to the remainder of the outersheath's cross section.

A device in accordance with this disclosure for removing an implantedobject from a body vessel, may include a handle, an elongated sheathextending from the handle, the elongated sheath comprising having aproximal end, a distal end, and a lumen extending from the distal endtoward the proximal end, wherein the lumen is configured to receive animplanted object, the elongated sheath further comprising a proximalportion and a distal portion, a tubular outer member attached to thedistal portion of the elongated sheath, wherein at least one portion ofthe tubular outer member has a non-uniform circumferential wallthickness, a pin attached to the tubular outer member and extendinginwardly thereof, and a tubular inner member located within the outermember, the tubular inner member comprising a proximal end, a distal endand an exterior surface therebetween, the distal end comprising acutting surface, the exterior surface of the inner member comprising acam slot for receipt of and cooperation with the pin such that uponactuation of the handle, the inner member rotates and the distal end ofthe inner member extends beyond the distal end of the elongated sheath.

The device may also include a non-uniform circumferential wall thicknesshaving a first segment and a second segment, wherein the first segmenthas a thickness greater than the second segment. The configuration ofthe device may be such that the first segment is disposed adjacent oropposite the second segment along a cross section of a circumference ofthe tubular outer member. The device may alternatively or additionallybe configured such that the first segment transitions to the secondsegment without interruption along the outer surface of the exteriorsheath, thereby creating a smooth and unpronounced transition between athicker wall portion and thinner wall portion.

The increased wall thickness of the outer sheath between the blade andthe exterior of the outer sheath may be particularly helpful toclinicians when navigating the device through curved regions of thevasculature. For example, the clinician may wish to rotate the outersheath to a position so that the increased wall thickness is adjacentthe exterior of a curved vasculature, thereby creating a greaterdistance between the blade and the vasculature. It may, therefore, behelpful for the clinician to know, by looking at the exterior of thedevice and/or an imaging device, where the rotational position of theouter sheath comprising the increased cross-sectional wall thickness islocated. Accordingly, the device may include an external indicator onthe sheath or the handle and/or radiopaque marker on the sheath toindicate to the clinician the position of the portion(s) of the outersheath that has the increased wall thickness. Accordingly, the presentdisclosure also discusses incorporating a second hollow inner memberwithin the inner sheath, particularly the distal end of the innersheath, including the inner cam member and the outer cam member.

There is also a need for a device, method and/or system such as asurgical device that has the capability to protect the lead as it entersinto lumen of the sheath while the sheath passes over the lead and/orthe surrounding tissue. Accordingly, another device in accordance withthis disclosure for removing an implanted object from a body vessel mayinclude a handle, an elongated sheath extending from the handle, theelongated sheath comprising a proximal end, a distal end, and a lumenextending from the distal end toward the proximal end, wherein the lumenis configured to receive an implanted object, the elongated sheathfurther comprising a proximal portion and a distal portion, a tubularouter member attached to the distal portion of the elongated sheath, apin attached to the tubular outer member and extending inwardly thereof,a first tubular inner member located within the outer member, the firsttubular inner member comprising a proximal end, a distal end and anexterior surface therebetween, the distal end comprising a cuttingsurface, the exterior surface of the first inner member comprising a camslot for receipt of and cooperation with the pin such that uponactuation of the handle, the first inner member rotates and the distalend of the first inner member extends beyond the distal end of theelongated sheath, and a second tubular inner member, wherein at leastone portion of the second tubular inner member has a non-uniformcircumferential wall thickness.

The device may also include the second tubular inner member'snon-uniform circumferential wall thickness having a first segment and asecond segment, wherein the first segment has a thickness greater thanthe second segment.

The outer member, first inner member and a second inner member aredescribed as tubular. The cross section of the exterior of outer member,first inner member and second inner member may have a variety ofdifferent shapes, such as circular, oval, elliptical, crescent, etc.depending upon whether the thickness of the wall for these members isuniform or non-uniform, as well as how the non-uniform shape is created.Similarly, the cross section of the lumen of first inner member andsecond inner member may have a variety of different shapes. And thecross section of the wall of the outer member, first inner member andsecond inner member may have a variety of different shapes.

There is a further need for a device, method and/or system such as asurgical device that has the capability to smoothly control theextension and rotation of a blade from a sheath. Accordingly, thepresent disclosure also discusses the incorporation of the linear slidethat smoothly converts linear actuation of the trigger to rotationalmovement and extension of the cutting blade. A further device forremoving an implanted object from a body vessel may comprise a handlecomprising a trigger, an elongated sheath extending from the handle, theelongated sheath comprising a proximal end, a distal end, and a lumenextending from the distal end toward the proximal end, wherein the lumenis configured to receive an implanted object, the elongated sheathfurther comprising a proximal portion and a distal portion, a tubularouter member attached to the distal portion of the elongated sheath, apin attached to the tubular outer member and extending inwardly thereof,a tubular inner member located within the outer member, the tubularinner member comprising a proximal end, a distal end and an exteriorsurface therebetween, the distal end comprising a cutting surface, theexterior surface of the inner member comprising a cam slot for receiptof and cooperation with the pin such that upon actuation of the handle,the inner member rotates and the distal end of the inner member extendsbeyond the distal end of the elongated sheath, and a rotary actuatordisposed within the housing, the rotary actuator comprising a linearslide coupled to the trigger, the linear slide comprising a shaft,wherein the shaft is coupled to the tubular inner member, such that uponlinear actuation of the trigger, the tubular inner member rotates.

The linear slide may also comprise a nut and leadscrew assembly, whereinthe leadscrew comprises the shaft. Also, the shaft may comprise anexterior surface, wherein at least a portion of the exterior surface isthreaded, and wherein the nut comprises a threaded portion and thethreaded portion of the exterior of the shaft matingly engages with thethreaded portion of the nut. Alternatively, the linear slide maycomprise a rolling ring bearing and an unthreaded shaft.

The phrases “at least one”, “one or more”, and “and/or” are open-endedexpressions that are both conjunctive and disjunctive in operation. Forexample, each of the expressions “at least one of A, B and C”, “at leastone of A, B, or C”, “one or more of A, B, and C”, “one or more of A, B,or C” and “A, B, and/or C” means A alone, B alone, C alone, A and Btogether, A and C together, B and C together, or A, B and C together.When each one of A, B, and C in the above expressions refers to anelement, such as X, Y, and Z, or class of elements, such as X₁- X_(n),Y₁-Y_(m), and Z₁-Z_(o), the phrase is intended to refer to a singleelement selected from X, Y, and Z, and a combination of elementsselected from the same class (e.g., X₁ and X₂) as well as a combinationof elements selected from two or more classes (e.g., Y₁ and Z_(o)).

The term “a” or “and” entity refers to one or more of that entity. Assuch, the terms “a” (or “an”), “one or more” and “at least one” may beused interchangeably herein. It is also to be noted that the terms“comprising”, “including”, and “having” may be used interchangeably.

A “lead” is a conductive structure, typically an electrically insulatedcoiled wire. The electrically conductive material may be any conductivematerial, with metals and intermetallic alloys common. The outer sheathof insulated material is biocompatible and bio stable (e.g.,non-dissolving in the body) and generally includes organic materialssuch as polyurethane and polyimide. Lead types include, by way ofnon-limiting example, epicardial and endocardial leads. Leads arecommonly implanted into a body percutaneously or and endocardial leads.Leads are commonly implanted into a body percutaneously or surgically.

The term “means” as used herein shall be given its broadest possibleinterpretation in accordance with 35 U.S.C. Section 112(f). Accordingly,a claim incorporating the terms “means” shall cover all structures,materials, or acts set forth herein, and all of the equivalents thereof.Further, the structures, materials or acts and the equivalents thereofshall include all those described in the summary of the invention, briefdescription of the drawings, detailed description, abstract, and claimsthemselves.

A “serration” or “serrated edge” or “serrated blade” or othervariations, as used herein, shall mean the configuration of a cuttingsurface having a notched edge or saw-like teeth. The notched edgescreate a plurality of smaller points that contact (and therefore lesscontact area with) the material being cut in comparison to an un-notchedblade. Additionally, the pressure applied by each serrated point ofcontact is relatively greater and the points of contact are at a sharperangle to the material being cut. One example of a serrated blade mayinclude one notch adjacent to and abutting another notch such that thereis very little, if any, blade between such notches, thereby creatingpoints of contact. There are multiple variations and/or features ofserrations. For example, one type of serrated feature is referred to asa “crown.” As used herein, a serrated blade, or other variation, in theshape of a “crown,” shall mean a blade comprising a plurality of notchesand adjacent un-notched areas such that the combination of notched andun-notched areas resembles a crown for a royal member (e.g., king,queen, etc.), particularly when the blade is circular. A further type of“crown” includes a “hook crown.” As used herein, a serrated blade, orother variation, in the shape of a “hook crown,” shall mean a bladecomprising a plurality of notches and adjacent un-notched areas, whereinthe length of un-notched areas of the blade are longer than the notchedareas of the blade.

A “surgical implant” is a medical device manufactured to replace amissing biological structure, support, stimulate, or treat a damagedbiological structure, or enhance, stimulate, or treat an existingbiological structure. Medical implants are man made devices, in contrastto a transplant, which is a transplanted biomedical tissue. In somecases implants contain electronics, including, without limitation,artificial pacemaker, defibrillator, electrodes, and cochlear implants.Some implants are bioactive, including, without limitation, subcutaneousdrug delivery devices in the form of implantable pills or drug-elutingstents.

It should be understood that every maximum numerical limitation giventhroughout this disclosure is deemed to include each and every lowernumerical limitation as an alternative, as if such lower numericallimitations were expressly written herein. Every minimum numericallimitation given throughout this disclosure is deemed to include eachand every higher numerical limitation as an alternative, as if suchhigher numerical limitations were expressly written herein. Everynumerical range given throughout this disclosure is deemed to includeeach and every narrower numerical range that falls within such broadernumerical range, as if such narrower numerical ranges were all expresslywritten herein.

The preceding is a simplified summary of the disclosure to provide anunderstanding of some aspects of the disclosure. This summary is neitheran extensive nor exhaustive overview of the disclosure and its variousaspects, embodiments, and configurations. It is intended neither toidentify key or critical elements of the disclosure nor to delineate thescope of the disclosure but to present selected concepts of thedisclosure in a simplified form as an introduction to the more detaileddescription presented below. As will be appreciated, other aspects,embodiments, and configurations of the disclosure are possibleutilizing, alone or in combination, one ore more of the features setforth above or described in detail below.

BRIEF DESCRIPTION OF THE DRAWINGS

The accompanying drawings are incorporated into and form a part of thespecification to illustrate several examples of the present disclosure.These drawings, together with the description, explain the principles ofthe disclosure. The drawings simply illustrate preferred and alternativeexamples of how the disclosure may be made and used and are not to beconstrued as limiting the disclosure to only the illustrated anddescribed examples. Further features and advantages will become apparentfrom the following, more detailed, description of the various aspects,embodiments, and configurations of the disclosure, as illustrated by thedrawings referenced below.

FIG. 1 is a perspective view of a human having a pacemaker lead locatedin the venous system and terminating electrode anchored to theventricular heart chamber, with an embodiment of a surgical device beingshown inserted into the body and partly advanced over the lead;

FIG. 2 is an elevation view of an embodiment of a surgical device;

FIG. 2A is an elevation view of an alternative embodiment of a surgicaldevice;

FIG. 3 is a cross-sectional view of a cutting sheath assembly within ablood vessel with an extendable and rotatable blade for removing a leadaccording to an embodiment of the disclosure;

FIG. 4A is an end view of the distal portion of the cutting sheathassembly according to an embodiment of the disclosure;

FIG. 4B is a cross-sectional view of the distal portion of the cuttingsheath assembly according to an embodiment of the disclosure, wherein aninner member is in a retracted position within the cutting sheathassembly;

FIG. 4C is a cross-sectional view of the distal portion of the cuttingsheath assembly according to an embodiment of the disclosure, wherein aninner member is in an extended position within the cutting sheathassembly;

FIG. 5A is a cross-sectional view of the distal portion of the cuttingsheath assembly according to an embodiment of the disclosure, wherein aninner sheath is in a retracted position;

FIG. 5B is cross-sectional view of the distal portion of the cuttingsheath assembly according to an alternate embodiment of the disclosure,wherein an inner sheath is in an extended position;

FIG. 6A is perspective view of an outer band member according to anembodiment of the disclosure;

FIG. 6B is an end view of the outer band member illustrated in FIG. 6A;

FIG. 6C is cross-sectional view of the outer band member illustrated inFIG. 6A taken along line 6C-6C of FIG. 6B;

FIG. 7A is perspective view of an inner band member according to anembodiment of the disclosure;

FIG. 7B is side view of the inner band member illustrated in FIG. 7A;

FIG. 7C is end view of the inner band member illustrated in FIG. 7A;

FIG. 7D is cross-sectional view of the inner band member illustrated inFIG. 7A taken along line 7D-7D in FIG. 7C;

FIG. 8A is perspective view of an inner band member according to anembodiment of the disclosure;

FIG. 8B is side view of the inner band member illustrated in FIG. 8A;

FIG. 8C is end view of the inner band member illustrated in FIG. 8A;

FIG. 8D is cross-sectional view of the inner band member illustrated inFIG. 8A taken along line 8D-8D in FIG. 8C;

FIG. 9A is perspective view of an inner band member according to anembodiment of the disclosure;

FIG. 9B is side view of the inner band member illustrated in FIG. 9A;

FIG. 9C is end view of the inner band member illustrated in FIG. 9A;

FIG. 9D is cross-sectional view of the inner band member illustrated inFIG. 9A taken along line 9D-9D in FIG. 9C;

FIG. 10A is perspective view of an inner band member according to anembodiment of the disclosure;

FIG. 10B is side view of the inner band member illustrated in FIG. 10A;

FIG. 10C is end view of the inner band member illustrated in FIG. 10A;

FIG. 10D is cross-sectional view of the inner band member illustrated inFIG. 10A taken along line 10D-10D in FIG. 10C;

FIG. 11A is perspective view of an inner band member according to anembodiment of the disclosure;

FIG. 11B is side view of the inner band member illustrated in FIG. 11A;

FIG. 11C is end view of the inner band member illustrated in FIG. 11A;

FIG. 11D is cross-sectional view of the inner band member illustrated inFIG. 11A taken along line 11D-11D in FIG. 11C;

FIG. 12A is perspective view of an inner band member according to anembodiment of the disclosure;

FIG. 12B is side view of the inner band member illustrated in FIG. 12A;

FIG. 12C is end view of the inner band member illustrated in FIG. 12A;

FIG. 12D is cross-sectional view of the inner band member illustrated inFIG. 12A taken along line 12D-12D in FIG. 12C;

FIG. 13A is perspective view of an inner band member according to anembodiment of the disclosure;

FIG. 13B is side view of the inner band member illustrated in FIG. 13A;

FIG. 13C is end view of the inner band member illustrated in FIG. 13A;

FIG. 13D is cross-sectional view of the inner band member illustrated inFIG. 13A taken along line 13D-13D in FIG. 13C;

FIG. 14A is side view of the outer member with the inner member of FIGS.7A-7D positioned in a retracted position within the outer sheath;

FIG. 14B is side view of the outer member with the inner member of FIGS.7A-7D positioned in an extended position within the outer sheath;

FIG. 15 is an illustration of the geometry of the cam slot of the innermember illustrated in FIGS. 7A-7D portrayed on a single plane;

FIG. 16 is a side view of the outer member with the inner member ofFIGS. 8A-8D positioned in a retracted position within the outer sheath;

FIG. 16B is a side view of the outer member with the inner member ofFIGS. 8A-8D positioned in a partially extended position within the outersheath;

FIG. 16C is a side view of the outer member with the inner sheath ofFIGS. 8A-8D positioned in a fully extended position within the outermember;

FIG. 17 is an illustration of the geometry of the cam slot of the innermember illustrated in FIGS. 8A-8D portrayed on a single plane;

FIG. 18 is a perspective view of an inner member having a cam slot withan extended stow region;

FIG. 19A is a side view of the outer member with the inner member ofFIG. 18 positioned in a retracted position within the outer sheath;

FIG. 19B is a side view of the outer member with the inner member ofFIG. 18 positioned in a partially extended portion within the outersheath;

FIG. 19C is a side view of the outer member with the inner member ofFIG. 18 positioned in a fully extended position within the outer sheath;

FIG. 20 is an illustration of the geometry of the cam slot of the innermember illustrated in FIG. 18 portrayed on a single plane;

FIG. 21 is a perspective view of an inner member having a duplex camslot;

FIG. 22A is a side view of the outer member with the inner member ofFIG. 21 positioned in a retracted position within the outer sheath;

FIG. 22B is a side view of the outer member with the inner member ofFIG. 21 positioned in a partially extended position within the outersheath.

FIG. 22C is a side view of the outer member with the inner member ofFIG. 21 positioned in a fully extended position within the outer sheath;

FIG. 23 is an illustration of the geometry of the cam slot of the innermember illustrated in FIG. 21 portrayed on a single plane;

FIG. 21 is a perspective view of an embodiment of a handle portion,including an indicator, of the surgical device;

FIG. 25 is a perspective view of an alternate embodiment of a handleportion, including an alternate indicator, of the surgical device;

FIG. 26 is a side view of an alternate embodiment of a handle portion,including an alternate indicator, of the surgical device;

FIG. 27 is a perspective view of an alternate embodiment of a handleportion, including an alternate indicator, of the surgical device;

FIG. 28 is a cross-sectional view of the distal portion of the cuttingsheath assembly according to an alternate embodiment of the disclosure,wherein a cutting blade in a retracted position;

FIG. 29A is perspective view of a distal tip of the outer sheathaccording to an embodiment of the disclosure;

FIG. 29B is side view of the distal tip illustrated in FIG. 29A;

FIG. 29C is proximal end view of the distal tip illustrated in FIG. 29A;

FIG. 29D is distal end view of the distal tip illustrated in FIG. 29A;

FIG. 30A is perspective view of a distal tip of the outer sheathaccording to an embodiment of the disclosure;

FIG. 30B is side view of the distal tip illustrated in FIG. 30A;

FIG. 30C is proximal end view of the distal tip illustrated in FIG. 30A;

FIG. 30D is distal end view of the distal tip illustrated in FIG. 30A;

FIG. 31A is perspective view of a distal tip of the outer sheathaccording to an embodiment of the disclosure;

FIG. 31B is side view of the distal tip illustrated in FIG. 31A;

FIG. 31C is proximal end view of the distal tip illustrated in FIG. 31A;

FIG. 31D is distal end view of the distal tip illustrated in FIG. 31A;

FIG. 32A is a perspective view of an inner member in a retractedposition within a distal tip of an outer according to an embodiment ofthe disclosure;

FIG. 32B is a perspective view of the inner member of FIG. 32A in anextended or partially extended position with respect to the distal tip;

FIG. 33 is perspective view of an inner band member according to anembodiment of the disclosure;

FIG. 34 is perspective view of an inner band member according to anembodiment of the disclosure;

FIG. 35 is perspective view of an inner band member according to anembodiment of the disclosure;

FIG. 36 is perspective view of an inner band member according to anembodiment of the disclosure;

FIG. 37 is perspective view of an inner band member according to anembodiment of the disclosure.

FIG. 38 is perspective view of an inner band member according to anembodiment of the disclosure;

FIG. 39 is a side elevation view of an elongated shaft or sheath that isconstructed by a series of interrupted cut hypotube segments;

FIG. 40A is perspective view of an outer cam member, an inner cammember, a tubular inner member with a cutting blade therebetweenaccording to an embodiment of the disclosure;

FIG. 40B is a distal end view of the outer sheath depicted in FIG. 40A;

FIG. 41A is perspective view of an outer cam member, an inner cammember, a tubular inner member with a cutting blade therebetweenaccording to an embodiment of the disclosure;

FIG. 41B is a distal end view of the outer sheath depicted in FIG. 41A;

FIG. 42A is perspective view of an outer cam member, an inner cammember, a tubular inner member with a cutting blade therebetweenaccording to an embodiment of the disclosure;

FIG. 42B is a distal end view of the outer sheath depicted in FIG. 42A;

FIG. 43A is perspective view of an outer cam member, an inner cammember, a tubular inner member with a cutting blade therebetweenaccording to an embodiment of the disclosure;

FIG. 43B is a distal end view of the outer sheath depicted in FIG. 43A;

FIG. 44A is perspective view of an outer cam member, an inner cammember, a tubular inner member with a cutting blade therebetweenaccording to an embodiment of the disclosure;

FIG. 44B is a distal end view of the outer sheath depicted in FIG. 44A;

FIG. 45 is a perspective view of a surgical device according to analternate embodiment of the disclosure, wherein the surgical deviceincludes a housing, handle, trigger and elongated shaft; and

FIG. 45A is an enlarged cross-sectional view of the surgical devicedepicted in FIG. 45. FIG. 45B is a transparent perspective view of thesurgical device depicted in FIG. 45.

It should be understood that the drawings are not necessarily to scale.In certain instances, details that are not necessary for anunderstanding of the disclosure or that render other details difficultto perceive may have been omitted. It should be understood, of course,that the disclosure is not necessarily limited to the particularembodiments illustrated herein.

DETAILED DESCRIPTION

Before any embodiments of the disclosure are explained in detail, it isto be understood that the disclosure is not limited in its applicationto the details of construction and the arrangement of components setforth in the following description or illustrated in the followingdrawings. The disclosure is capable of other embodiments and of beingpracticed or of being carried out in various ways. Also, it is to beunderstood that the phraseology and terminology used herein is for thepurpose of description and should not be regarded as limiting. The useof “including,” “comprising,” or “having” and variations thereof hereinis meant to encompass the items listed thereafter and equivalentsthereof as well as additional items.

Embodiments according to this disclosure provide a surgical device thatincludes a sheath, which can be deployed safely within a vascular systemof a patient and separate implanted objects, such as leads, from apatient's vasculature system. FIG. 1 depicts a surgical device 108having a sheath 112 inserted within an exemplary patient 104. The sheath112 surrounds an implanted lead (not shown) running along the leftinnominate vein past the SVC and connected into, or about, the rightventricle of the heart. Upon surrounding the lead with the sheath, theuser of the surgical devise may actuate the handle, thereby extending acutting blade (not shown) beyond the distal end of the sheath 112 to cutthe tissue surrounding the lead within the patient's SVC. When theclinician releases the handle, the cutting blade returns within thesheath 112, thereby allowing the clinician to force and advance thedistal portion of the sheath against additional uncut tissue. Theclinician repeats the actuation step, thereby causing the cutting bladeto re-appear and extend beyond the distal end of the sheath 112 to cutthe adjacent tissue. Each time actuation occurs, the proximal portion ofthe implanted lead and/or surrounding tissue enters into a hollowpassageway within the sheath 112. This process is again repeated untilthe implanted lead and/or surrounding tissue is completely orsubstantially separated from the tissue attached to the SVC. At thattime, the implanted lead may safely be removed from the patient's SVC.

With reference to FIG. 2, an exemplary surgical device 200 is depicted.The surgical device 200 includes a handle 204 and an outer sheath 208.The surgical device also includes an inner sheath (not shown) locatedwithin the outer sheath 208. It may be preferable for the outer sheath208 to remain stationary while the inner sheath is capable of moving(e.g., rotating and extending) with respect to the outer sheath 208. Theinner sheath and outer sheath 208 can both be flexible, rigid or acombination thereof.

The handle 204 includes a trigger 212 which pivots about a pin (notshown) that attaches the trigger 212 to the handle 204. Attached to theportion of the trigger 212 within the handle 204 is a first gear (notshown). Also included within the handle 204 is second gear and a thirdgear (both of which are not shown). The first gear meshes with thesecond gear, which in turn meshes with the third gear. The third gearhas an opening through its center, wherein the opening is sized andconfigured to allow the inner sheath to be inserted and affixed thereto.When a use (i.e., clinician) actuates the handle 204, it pivots aboutthe pin, thereby causing the handle 204 and first gear to move in acounter clockwise direction. The first gear engages the second gear andcauses the second gear to rotate. The second gear, in turn, engages thethird gear initiating it and the inner sheath to rotate about thesheath's longitudinal axis A-A.

The handle may also include a spring (not shown) that is attached to thegears, sheath and/or some other member therein such that, upon theclinician's release of the handle, the spring facilitates rotation ofthe inner sheath in a direction opposite to that in which it rotatedupon actuation of the handle 204. It may be preferable for the innersheath to rotate in a clockwise direction about its longitudinal axisfrom the perspective of the proximal end of the surgical device 200. Ifso, the spring will facilitate the inner sheath rotation in acounter-clockwise direction upon the clinician's release of the trigger212.

The trigger 212 and gears are one example of an actuation means forcausing the inner sheath to rotate about its longitudinal axis. However,a variety of different triggers and gearing may cooperate to rotate theinner sheath. For example, the trigger 212 depicted in FIG. 1 includestwo openings 216, 220. A trigger, however, may have less than or morethan two openings. Additionally, a trigger may also be comprised of astraight or non-linear member without any openings. Furthermore, atrigger may be in the shape of a button capable of being depressed. Aslong as the trigger, either alone or in conjunction with the handle, isergonomically correct and comfortable for the clinician, the trigger mayhave a variety of sizes and shapes.

The actuation means discussed above includes three gears. A lower orhigher number of gears, however, may be used in lieu of three gears.Many different types of gears are available. Non-limiting examples ofgears include, but are not limited to, spur gears, helical gears, doublehelical gears, bevel gears, spiral bevel gears, hypoid gears, crowngears, worm gears, non-circular gears, rack and pinion gears, epicyclicgears, sun and planet gears, harmonic drive gears, cage gears, andmagnetic gears. Any one and/or combination of these types or other typesof gears could be used.

The trigger 212 and gear(s) configuration discussed above is an exampleof a mechanical actuation means to rotate the inner sheath. In analternate embodiment, the actuation means may comprise electromechanicalcomponents. For example, the actuation means may comprise an electricmotor (not shown) having a driven shaft that is directly or indirectlycoupled to the inner sheath. The motor's shaft may be indirectly coupledto the inner sheath by one or more gears discussed hereinbefore. Themotor may be controlled by a switch, thereby causing the inner sheath torotate in a clockwise and/or a counterclockwise direction upon actuatinga switch that may also act as the trigger. The electric motor may beeither a direct current (DC) motor or an alternating current (AC) motor.Accordingly, the motor may be powered by a DC source, such as a battery,or an AC source, such as a conventional power cord. Additionally, thoseskilled in the art will appreciate that there are numerous other ways inwhich a surgical device comprising a rotatable sheath may be actuatedand driven.

It may be preferable for a portion of the outer sheath to be rigid and aportion of the outer sheath to be flexible. With reference to FIG. 2A,an exemplary surgical device 200′ comprising an outer sheath having arigid outer portion 222 and a flexible outer portion 224 is depicted.Both the rigid outer portion 222 and a flexible outer portion 224 areconstructed of materials suitable for insertion into the human body. Forexample, the rigid outer portion 222 may be constructed of stainlesssteel, and the flexible outer portion 224 may be constructed of aflexible polymer such as polytetrafluoroethylene or thermoplasticelastomers.

The rigid outer portion 222 and flexible outer portion 224 form aunitary outer sheath. The rigid outer portion 222 has a proximal end 236and a distal end 238. Similarly, the flexible outer portion 224 has aproximal end 228 and a distal end 232. The distal end 238 of the rigidouter portion 222 is connected to the proximal end 228 of the flexibleouter portion 224, thereby forming a unitary outer sheath. Themechanism(s) to connect the distal end 238 of the rigid outer portion222 and the proximal end 228 of the flexible outer portion 224 are notdescribed herein and are conventional, and need not be further explainedor illustrated to enable one skilled in the art to utilize the mechanismfor the purposes described. For example, the configuration and/or shapeof the proximal end 228 may be such that it may interlock with thedistal end 238 for example via a barbed joint. Although the interlockmechanism described herein may be preferred, it is not intended torepresent the only way that such a connection can be accomplished. Allsuch techniques within the knowledge of one skilled in the art areconsidered within the scope of this disclosure.

Similar to the flexible outer sheath 224, the inner sheath is generallyflexible in order to accept, accommodate and navigate the patient'svasculature system. In addition to being flexible, the inner and/orouter sheaths may also have a high degree of stiffness in order toreceive the torque transferred from the actuation means and transfersufficient torque to the cutting blades discussed in more detail below.The inner and/or outer sheaths may be formed of a polymer extrusion,braided reinforced polymer extrusion, coils, bi-coils, tri-coils, lasercut metal tubing and any combination of the above. Referring to FIG. 39,the inner and/or outer sheaths may be a unitary structure 3900, such asa hypotube, comprising multiple segments 3904, 3908, 3916, 3920, 3924,3928. The hypotube may include segments having the same rigidity and/orflexibility, or the hypotube may include segments having a variety ofdifferent rigidity and flexibility characteristics to yield the overalldesirable rigidity and flexibility for the hypotube. The segments mayinclude radially patterned cuts that extend partially into and/or fullythrough the wall of the tube. The pattern of each and/or multiplesegments may include altering the depth, width, pitch, circumferentiallength, etc. may to produce the desired flexibility and rigidity profilefor the inner sheath (and/or outer sheath) when constructed from ahypotube. Additionally, if the inner and/or outer sheaths have multiplesegments, those multiple segments may be attached in a manner similar tothe manner in which the rigid outer sheath 222 and flexible outer sheath224 are connected.

With reference to FIGS. 4A, 4B and 4C, an exemplary distal portion ofthe flexible inner and outer sheaths of a surgical device is depicted.The assembly 400 includes a flexible inner sheath 426 located withinflexible outer sheath 404. Attached to the distal portion of theflexible outer sheath 404 is an outer cam member 408, which is discussedin more detail below. The distal end of the flexible outer sheath 404 isgenerally smooth and evenly rounded at its most distal point, therebyallowing it to act as a dilator when pressed and forced against tissue.And the distal end of the outer cam member 408 is also longitudinallyaligned with the distal end of the flexible outer sheath 404. The distalend 430 of the flexible inner sheath 426 is connected to the proximalend 418 of inner cam member 412, which is discussed in more detailbelow. The distal end 422 of inner cam member 412 includes a cuttingsurface capable of cutting tissue.

The inner sheath 426 is coupled to the outer sheath 404 through theinner cam member 412 and the outer cam member 408 via pin 410. One endof the pin 410 is fixed within the outer cam member 412, and the otherend of the pin 410 is located within the cam slot 414 of the inner cammember 412. As the inner sheath 426 extends, via the actuation meansdiscussed above, the inner cam member 412 extends distally in thedirection of the arrow (→) and rotates according to the profile of thecam slot 414. As the inner cam member 412 extends distally and rotates,the outer sheath 404, outer cam member 408 and pin 412 remainstationary. Thus, as the inner cam member 412 extends distally (andpotentially proximally according to the cam slot profile) and rotatesthe cutting surface at the distal end 422 of the inner cam member 412 isable to perform a slicing action against the tissue and cut it.

FIG. 4B depicts the inner cam member 412 within a retracted (anun-actuated) position because the inner cam member 412 is in its mostproximal position. Stated differently, the distal end 422 of the innercam member 412 of FIG. 4B is located within the interior of the outercam member 408 and does not extend beyond the distal end of the outercam member 408. With reference to FIG. 4C, the inner cam member 412 isdepicted in an extended (and actuated) position because the inner cammember 412 is in its most distal position extending beyond the distalend of the flexible outer sheath 404 and the outer cam member 408.

FIG. 3 depicts the distal portion of the flexible outer sheath andflexible inner sheath of FIG. 4C surrounding a lead 530 within apatient's vein 534 with the inner cam member 412 in its extendedposition. The circumferential nature of the cutting blade at the distalend of the inner cam member causes the surgical device to act as acoring device, thereby cutting tissue 538 either partially (i.e., lessthan 360 degrees) or completely (i.e., 360 degrees) around the lead orimplanted object being extracted. The amount of tissue that the bladecuts depends upon the size, shape and configuration of the lead, as wellas the diameter and thickness of the circular cutting blade. Forexample, if the diameter of the circular blade is substantially greaterthan the diameter of the lead, then the blade will cut and core moretissue in comparison to a cutting blade having a smaller diameter. Oncethe desired cut has been made, the operator releases trigger and theinner cam member (including the blade) returns to its retractedposition. Once the blade is in the retracted position, the distal tip408 of the cam member 404 (and/or outer sheath) safely acts as adilating device, thereby stretching tissue as the sheaths move over thelead or implanted object to be extracted.

Although the inner sheath and outer sheath are coupled to one anothervia the inner cam member, outer cam member, and pin, the sheaths may becoupled to one another in other ways. Stated differently, those of skillin the art will understand how to make and use the disclosed aspects,embodiments, and/or configurations after understanding the presentdisclosure to couple the sheaths in a manner to allow a cutting surfaceto extend and rotate beyond the distal end of the outer sheath. All suchconfigurations within the knowledge of one skilled in the art areconsidered within the scope of this disclosure. For example, referringto FIGS. 5A and 5B, the assembly 500 may include an outer sheath 504 andan inner sheath 526 coupled to one another via pin 510 without the useof an outer cam member or inner member as in FIGS. 4B and 4C. The outersheath 504 may have a pin 510 connected to it, and the inner sheath 526may include cam slot 514 such that as the inner sheath 526 extends uponactuation of the actuation means discussed earlier herein, the innersheath 526 along with its cutting surface, also rotates according to thecam slot 514 profile. While the inner sheath 526 extends and rotates,the outer sheath 504 and pin 510 remain stationary. FIG. 5A depicts theinner sheath 526 (and cutting surface 522) of assembly 500 in aninitially retracted and stowed position. FIG. 5B depicts the innersheath 526 (and cutting surface 522) of assembly 500′ in an extendedposition. As the actuation means is actuated and unactuated, theassembly moves from a retracted position to an extended position andvice versa.

With reference to FIGS. 6A, 6B and 6C, an exemplary outer cam member 600is depicted. The outer cam member 600 is a sleeve in the shape of ahollow cylinder. Although the exterior of the outer cam member 600 isuniform, it need not be. The interior of the outer cam member 600 is notuniform. For example, the interior of the outer cam member 600 includesan abutment 616 to prevent the inner cam member (not shown) fromtraveling further from the proximal end 612 to the distal end 608 withinthe outer cam member 600. The outer cam member 600 also includes a hole604 for receipt and possible attachment of a pin (not shown) whichprotrudes radially inward. As discussed in more detail below, the pinengages the cam slot of the inner cam member. The size, shape andconfiguration of the outer cam member 600 may differ depending upon howit is attached to the flexible outer sheath. As discussed above, theouter sheath may be stationary. If so, the outer cam member 600 and thepin remain stationary as the inner cam member moves relatively thereto.

With reference to FIGS. 7A, 7B, 7C and 7D, an exemplary inner cam member700 is depicted. The inner cam member 700 has a generally hollowcylindrical shape. The inner cam member 700 comprises a proximal portion724, an intermediate portion 728, and a distal portion 732. The outsidediameter of the proximal 724 is sized to allow the distal end 704 of theinner cam member 700 to be inserted to and engage (or otherwise attachedto) the interior diameter of the inner flexible sheath (not shown). Thedistal end 708 of the inner cam member 700 comprises a cutting surface712 having a flat, sharp blade profile. The intermediate portion 728comprises a cam slot 716 cut within its exterior surface. As the innerflexible sheath rotates and moves within the outer sheath—from itsproximal end to distal end—the outer sheath and pin may remainstationary. If so, the inner sheath, which is connected to the inner cammember, forces the inner cam member to rotate and move toward the distalend of the outer sheath. The cam slot 716 engages the pin, and the shapeand profile of the cam slot 716 controls the rate and distance withwhich the inner cam member 700 travels. That is, the configuration ofthe cam slot controls how the inner cam member travels both laterallyand rotationally.

The cam slot 716 in FIGS. 7A, 7B, 7C and 7D can have a linear profile(not shown). An alternative example of a two dimensional representationof the profile of the cam slot is depicted in FIG. 15. When the pin isposition A on the left hand side of FIG. 15, the inner cam member (andblade) is in the retracted position, as depicted in FIG. 14A. As theinner cam member rotates about 180 degrees and extends (from left toright in FIG. 15), the cam slot 1504 travels along the pin from positionA to position B at a relatively constant rate because the slope of thecam slot between these two points is relatively linear. That is, thereis a substantially linear portion within the cam slot 1504 betweenposition A and position B even though the overall shape of the cam slot1504 is generally sinusoidal. The sinusoidal shape, particularly at thetransition points, namely position A and position B, allows for a smoothtransition from extension to retraction through such positions whilemaintaining a relatively constant rate of rotation. Upon reachingposition B, the inner cam member is in its fully extended position, asdepicted in FIG. 14B. As the inner cam member continues to rotateanother 180 degrees, the cam slot travels along the pin from position Bback to its original retraction position A at a relatively constant ratebecause the slope of the cam slot between these two points is relativelylinear. FIG. 15 illustrates the cam slot 1504 in an open and continuousconfiguration. Accordingly, as the inner cam member continues to rotatebeyond 360 degrees, the path of inner cam member is repeated and itcontinues to travel from position A to position B to position A. And dueto the substantially linear configuration of the cam slot profile fromposition A to position B, and vice versa, the inner cam member (andblade) extends and/or rotates at a substantially constant rate betweenpositions.

FIG. 15 also illustrates that the inner cam member (and blade) bothextends and retracts for a predetermined amount of rotation. Forexample, assuming the blade is able to rotate 360 degrees, the bladeextends from position A to position B in FIG. 15 for the first 180degrees of rotation, and the blade retracts from position B to positionA for the second 180 degrees of rotation. As discussed herein, as thetrigger of the handle is linearly actuated, the inner cam member (andblade), via the coupled inner sheath, rotates a predetermined amount ofdegrees, and the inner cam member extends and retracts according to theinner cam member's cam slot profile. Accordingly, as the trigger of thehandle is linearly actuated, the inner cam member (and blade) bothextends and retracts while rotating. That is, the inner cam member (andblade) both extends and retracts according to the cam slot profile upona single actuation of the trigger.

Referring again to FIGS. 7A, 7B, 7C and 7D, the inner cam member 700 mayalso comprise a step up 720 such that the diameter of the intermediateportion 728 is greater than the distal portion 732. As the inner cammember 700 rotates, and the cutting surface 712 extends beyond thedistal end of the outer cam member into its extended position, the stepup 720 of the inner cam member 700 contacts the abutment of the outercam member, thereby limiting the distance that the inner cam member 700may travel and/or may prevent the inner cam member from exiting orextending beyond the distal tip of the outer sheath (or outer cammember) in the event that the pin is sheared.

With reference to FIGS. 8A, 8B, 8C and 8D, and alternative exemplaryinner cam member 800 is depicted. The inner cam member 800 depicted inFIGS. 8A-8D is similar to the inner cam member 700 depicted in FIGS.7A-7D because the inner cam member 800 has a proximal portion 824, anintermediate portion 828, a distal portion 832 and a sharp cuttingsurface 712 with a flat profile at its distal end 808. Unlike the innercam member 700, which has a linear cam slot profile, however, the innercam member 800 has a cam slot 816, which when extended in atwo-dimensional plane, has a non-linear profile. For example, anillustration of a two-dimensional, non-linear cam slot profile 1700 isdepicted in FIG. 17.

Continuing to refer to FIG. 17, there is depicted cam slot 1704. As theflexible inner sheath extends distally within the outer sheath, thecooperation between the pin and the cam slot causes the inner cam memberto also rotate and travel toward and beyond the distal end of the outercam member. The rate and distance at which the inner cam member travelsis dependent upon the configuration of the cam slot, particularly theslope of the cam slot. If the profile of the cam slot, such as itsslope, is non-linear, then the rate and distance at which the inner cammember travels will vary as the inner cam member rotates and moves overthe pin along the cam slot path. For example, when the inner cam memberis in its fully retracted position (see FIG. 16A), the pin contacts thecam slot 1704 at position A identified as a first point marked+withinthe left hand side of FIG. 17. When the inner cam member is in itspartially extended position (see FIG. 16B), the pin contacts the camslot 1704 at a second point marked+and identified as position B withinFIG. 17. When the inner cam member is in its fully extended position(see FIG. 16C), the pin contacts the cam slot 1704 at another pointmarked+and identified as position C within FIG. 17. This two-dimensionalrepresentation of the cam slot 1704 illustrates a non-linear profile ofthe cam slot because in order for the inner cam member to fully extend,it must travel at more than one rate from position A to position C. Thatis, the blade rotates at a first predetermined rate from position A toposition B (partially extended position), and the blade rotates at asecond predetermined rate from position A′ to position C (fully extendedposition).

For example, as the inner cam member rotates and the pin contacts thecam slot 1704, the cutting surface travels at a rate according to theprofile of the cam slot 1704 from its fully retracted position (see FIG.16A) to a position that is slightly beyond the distal end of the outercam member (see FIG. 16B) over about 90 degrees of rotation by the innercam member. The profile of the cam slot from position A to position B isgenerally linear, thereby causing the inner cam member to travel at agenerally constant rate between those two positions. As depicted in FIG.17, the blade extends a predetermined distance for the about of rotation(90 degrees) from position A to position B. Once the blade travels toits partially extended position B, the blade continues to rotate and theblade returns to its retracted position A′ over about 90 degrees ofrotation by the inner cam member. The profile of the cam slot fromposition B to position A′ is generally linear; therefore, the bladeextends at a generally constant rate between those two positions. As theas the inner cam member continues to rotate and the pin contacts the camslot 1704 beyond position A′ and toward position C over about another 90degrees of rotation, the blade extends a second predetermined distance.That is, the cutting surface travels beyond its partially extendedposition and to its fully extended position (see FIG. 16C). The profileof the cam slot from position A′ to position C is difference than theprofile of the cam slot from position A to position B. Although theprofile of the cam slot from position A to position B is generallylinear, the first predetermined amount of extension (from position A toposition B) is less than the second predetermined amount of extension(from position A′ to position C). Thus, the profile of the cam slot fromposition A to position B is such that the blade extends a shorterdistance in comparison to extending from position A′ to position C for apredetermined amount of rotation (90 degrees), thereby providing moreprecise and finer control of the blade as it rotates and extends. Movingan extending the inner cam member at a generally constant rate for ashort distance provides the clinician precise control of the blade as itinitially extends beyond the outer sheath. Stated differently, theprofile of the cam slot from position A′ to position C is such that theblade extends further and more quickly for a predetermined amount ofrotation (90 degrees) after it is initially extended, thereby providingrelatively less precision and coarser control of the blade in comparisonto extending from position A to position B. Accordingly, the inner cammember and blade travel at a faster rate from position to A′ to positionC (and from position C to position A″) in comparison to traveling fromposition A to position B. In order for the blade to fully extend toposition C, the blade travels at more than one rate—one rate fromposition A to position B (and from position B to position A′) andanother rate from position A′ to position C. Thus, even though the ratesof travel from the position A to position B (and from position B toposition A′) and from position A′to position C may both be relativelyconstant for each individual portion of travel, the overall rate oftravel is variable.

The discussion above discusses that the inner cam member travels atcertain rates (e.g., constant, variable). However, the rates are alsodependent upon the speed at which the inner sheath extends, and in turn,upon the speed of the means for actuating. For example, if the means foractuation includes a handle and one or more gears connecting the handleto the elongated inner sheath, then the rate at which the inner cammember rotates and extends is dependent upon how quickly the clinicianoperating the surgical device compresses the handle. Accordingly, thediscussion and/or comparison of the rates at which the blade extendstravels assumes that the means for actuating extends the inner sheath ata relatively constant speed. Regardless of whether this assumption iscorrect, the greater amount of blade extension per predetermined amountof rotation, the blade will extend at a greater rate and speed, therebyproviding the surgical device with the ability to cut more tissue perrotation.

FIG. 17 also illustrates that the inner cam member (and blade) bothextends and retracts a plurality of times for a predetermined amount ofrotation. As discussed above with respect to FIG. 15, the inner cammember extends and retracts once over predetermined amount of rotation.FIG. 17, however, illustrates that the inner cam member, extends andretracts twice for a predetermined amount of rotation. Accordingly, asthe trigger of the handle is linearly actuated, the inner cam member mayboth extends and retracts while rotating. That is, the inner cam membermay extend and retract a plurality of times, according to the cam slotprofile of the inner cam, when the inner sheath rotates a predeterminedamount upon a single actuation of the trigger.

Although the discussion above with respect to FIGS. 8 and 17 onlydiscuss a certain number of linear and non-linear profile portions ofthe cam slot, that discussion is not intended to limit the scope of thisdisclosure to only a fixed number of linear and non-linear profileportions. Depending upon the desired rate(s) at which the blade mayrotate and extend, the cam slot may have additional multiple linear andnon-linear profile portions of the cam slot. Those of skill in the artwill understand how to make and use the disclosed aspects, embodiments,and/or configurations after understanding the present disclosure toadjust the distance, rate and rotational aspects at which the inner cammember (or other cam members) travels. All such configurations withinthe knowledge of one skilled in the art are considered within the scopeof this disclosure.

As mentioned above, the cam slot profile of FIG. 15 is an open andcontinuous configuration, thereby allowing the inner cam member tocontinuously rotate. The cam slot profile of FIG. 17, however is aclosed configuration such that when the inner cam member reaches itsfully extended position (i.e., position C) or returns to position A″,the actuation means must be releases or reversed so that the inner cammay return to initial retracted position A. Although certain figures inthis disclosure only illustrated either the open or closed cam slotconfiguration, either configuration may be used with any of the innercam embodiments disclosed and/or discussed herein and are consideredwithin the scope of this disclosure. Additionally, the angular degree(s)to which the cam slots surround the circumference of the inner cammember, particularly its intermediate section, is not limited. Forexample, although the open cam slot typically surrounds 360 degrees ofthe circumference of the inner cam member, the scope of this disclosureincludes an open cam slot profile surrounding more than 360 degrees ofthe circumference of the inner cam member. Also, the closed cam slotprofile may surround the circumference of the inner cam member anynumber of times (i.e., 0.5, 0.75, 1.0, 1.25, 1.5, 1.75, 2.0, 2.25, 2.5,2.75, 3.0, 3.25, 3.5, 3.75, 4.0, etc.)—either wholly or partially.Stated differently, the closed cam slot may surround the circumferenceof the inner cam member to produce any degree of actuation (e.g.,between 0-1440 degrees) and any increment (e.g. 1°, 2°, 3°, 4°, 5°, 10°,15°, 20°, 25°, etc.) thereof.

With reference to FIGS. 9A, 9B, 9C and 9D, an alternative exemplaryinner cam member 900 is depicted. The inner cam member 900 depicted inFIGS. 9A-9D is similar to the inner cam member 900 depicted in FIGS.8A-8D because the inner cam member 900 has a proximal portion 924, anintermediate portion 928, a distal portion 932, and a cam slot 916 thatis similar to cam slot 816. Unlike the inner cam member 800, which has asmooth cutting surface, inner cam member 900 has a serrated cuttingsurface 912. The cutting surface 912 depicts fourteen (14) serrations.However, it may be preferable to have between twelve (12) and sixteen(16) serrations.

Although the cutting surface 912 illustrates a certain number ofserrations, FIGS. 9A-9D are not intended to represent the only numberand type of serrations that may be included in a serrated cuttingsurface. Depending upon the size of the surgical device, including thesheaths, and cam members, those of skill in the art will understand howto make and use the disclosed aspects, embodiments, and/orconfigurations after understanding the present disclosure to adjust thenumber, size and configurations of the serrations. All suchconfigurations within the knowledge of one skilled in the art areconsidered within the scope of this disclosure. For example, referringto FIGS. 11A, 11B, 11C and 11D, an alternative exemplary inner cammember 1100 is depicted having a cutting surface 1112 comprisingmultiple serrations in the form of a crown. Also, referring to FIGS.12A, 12B, 12C and 12D, an alternative exemplary inner cam member 1200 isdepicted having a cutting surface 1212 comprising multiple serrations inthe form of a hook crown. The cutting surface also need not be serrated,but merely include a plurality of notches formed therein. For example,with reference to FIGS. 13A, 13B, 13C and 13D, a further alternativeexemplary inner cam member 1300 is depicted having a cutting surfacewith four notches 1350 included therein. Furthermore, the notches maycomprise a myriad of different shapes and configurations, including butnot limited to any variation of a square, rectangle, rhombus,parallelogram, trapezoid, triangle, circle, ellipse, kite, etc.

The cutting surface discussed hereinbefore with respect to FIGS. 7, 8,9, 11, 12 and 13 are substantially parallel to the proximal edge of theinner cam members. In other words, the plane of the proximal end of theinner cam member and the plane of the distal end (e.g., cutting surface)of the inner cam member in these figures are substantially parallel. Theproximal and distal ends of the inner cam member, however, need not beparallel or co-planer. Rather, any of the cutting surfaced depicted inFIGS. 7, 8, 9, 11, 12 and 13 may be offset from the plane of theproximal end of the inner cam member. With reference to FIGS. 10A, 10B,10C and 10D, an alternative exemplary inner cam member 1000 is depicted.The plane of the cutting surface 1008 of the inner cam member 1000 isoffset from a plane parallel to the plane of the proximal end 1004 ofthe inner cam member at an angle α. It may be preferable for angle α tobe at an angle between zero degrees and ninety degrees. The outer cammember may also have a distal end having a plane between zero degreesand ninety degrees, and the plane of the distal end of the outer cam maybe the same or offset from the plane of the cutting surface of the innercam.

The cam slots included within the inner cam members depicted FIGS. 7-13surround the circumference of the inner cam member one time. It mayadvantageous, however, for the cam slot to surround the inner cammember's circumference more than once. For example, with reference toFIG. 18, there is depicted an inner cam member 1800 having a cam slot1816 that travels more than 360 degrees around its circumference. Theportion 1848 of the cam slot 1816 that is closest to the distal end 1808of the inner cam member 1800 and that extends beyond the other end ofthe cam slot 1816 is substantially parallel to the planes of theproximal end 1804 and distal end 1808. The profile of cam slot 1816depicted in one dimension is illustrated in FIG. 20 as the inner cammember 1800 moves from a retracted position (see FIG. 19A) to partiallyextended position (see FIG. 19B) and eventually to a fully extendedposition (see FIG. 19C).

The configuration and profile of portion 1848 of the cam slot 1816prevents the inner cam member 1800 from moving from its retractedposition, even if the inner cam member 1800 begins to rotate. That is,the inner cam member 1800 remains stowed in its retracted position aslong as the pin engages only portion 1848 of cam slot 1816, therebyinsuring that the blade is completely retracted as the clinicianmaneuvers the surgical device within the patient's vascular system.Referring to FIG. 20, there is depicted a two-dimensional cam slotprofile of the configuration of the cam slot 1816 of FIG. 18. The camslot profile depicted in FIG. 20 is similar to the configuration of thecam slot profile depicted in FIG. 17, with the exception that the camslot profile depicted in FIG. 20 further includes a portion thatsurrounds the circumference of the inner cam member more than once. Thatis, the cam slot is included in about another 90 degrees of travelaround the circumference of the inner cam member over and above the 360degrees of travel. This additional portion—the portion that extendsaround the circumference of the inner cam member more than 360degrees—is depicted as the substantially flat profile portion to thebottom right hand side of FIG. 20 that begins with a point marked+andidentified as position A. This substantially flat profile portioninsures that the blade remains stowed within the outer cam member as theinner cam member begins to rotate, thereby increasing the safety of thedevice and minimizing the likelihood of the blade being exposed beyondthe distal end of the outer cam prior to actuation. Although FIG. 20illustrates the flat portion of the cam slot as an extended in anembodiment with a cam slot greater than 360 degrees around thecircumference of the inner cam member, the flat portion, which createsthe stowed position, can be included within a cam slot that is equal toor less than 360 degrees around the circumference of the inner cammember.

With reference to FIG. 21, there is depicted an inner cam member 2100having a cam slot 2116 that travels about 720 degrees around itscircumference. The profile of cam slot 2116 depicted in two dimensionsis illustrated in FIG. 23 as the inner cam member 2100 moves from aretracted position (see FIG. 22A) to a partially extended position (seeFIG. 22B) and eventually to a fully extended position (see FIG. 22C).Referring to FIG. 23, the blade extends from position A, whichcorresponds to the retracted position of FIG. 22A, to position B, whichcorresponds to the partially extended position of FIG. 22B over about180 degrees of rotation by the inner cam member 2100. The blade thenretracts from position B to position A′ over about 180 degrees ofrotation by the inner cam member 2100. The blade can then extends fromposition A′, which corresponds to the retracted position of FIG. 22A, toposition C, which corresponds to the fully extended position of FIG. 22Cover about 180 degrees of rotation by the inner cam member 2100. Lastly,the blade retracts from position C to position A″ over about 180 degreesof rotation by the inner cam member 2100. The benefit of increasing thelength of the cam slot 2116 to a length greater than the circumferenceof the inner cam member to twice as long as the circumference of theinner cam member (i.e., 720 degrees) in comparison to the cam slot ofFIG. 17, which is only passes over the circumference one time (i.e., 360degrees), is that the blade and inner cam member can rotate about twiceas much for the same amount of extension. Accordingly, the blade has theability to rotate and potentially create a greater amount of cuttingaction against the tissue for a predetermined amount of extension.

The discussion above with respect to FIG. 23 explains how the bladetravels according to the cam slot profile for a full 720 degrees ofrotation because the inner cam member includes a double lobe camprofile. During actuation, however, the inner cam member does not needto travel the entire 720 degrees of rotation. For example, the clinicianoperating the surgical device can actuate the means for actuation suchthat the inner cam member repeats the travel from position A to positionB rather than continuing onward to position C. Allowing the clinician torepeat the inner cam member's path of travel from position A to positionB allows the clinician to operate the surgical device in precisioncutting mode for a longer period of time. Alternatively, the clinicianoperating the surgical device can actuate the means for actuation suchthat the inner cam member repeats the travel from position A′ toposition C rather than restarting from position A and moving to positionC. Allowing the clinician to repeat the inner cam member's path oftravel from position A′ to position C allows the clinician to operatethe surgical device in a coarser cutting mode for a longer period oftime. This allows the clinician to alternate the use of the surgicaldevice (1) in either a precision cutting mode or a coarse cutting mode,(2) by alternating between the precision cutting mode and the coarsecutting mode, and/or (3) using a variable mode, which includes thecombination of both the precision cutting mode and coarse cutting mode.

As discussed above, although certain figures in this disclosure onlyillustrate either the open or closed cam slot configuration that providefor certain degrees of rotation of the inner cam, either the open or theclosed cam slot configurations for any amount of rotation. Accordingly,any of the discussed open or closed cam slot configurations may be usedwith any of the inner cam embodiments disclosed and/or discussed hereinand are considered within the scope of this disclosure. Additionally,although certain figures in this disclosure only illustrate certaincutting surfaces, any cutting surface may be used with any of the innercam embodiments disclosed and/or discussed herein and are consideredwithin the scope of this disclosure. For example, FIGS. 33-38 illustratean inner cam member comprising a serrated blade, but any type of cuttingsurface may be used with the embodiments for the inner cams depicted inthese figures.

Referring to FIG. 33, the inner cam member 3300 has a proximal portion3324, an intermediate portion 3318, and a distal portion 3332. Thedistal portion 3332 of the inner cam member 3300 has a serrated cuttingsurface 3312. The inner cam member 3300 also has a cam slot 3316 havingclosed configuration with a generally linear profile. The cam slot 3316surrounds about half the circumference of the intermediate portion 3318of the inner cam member 3300. Accordingly, the closed cam slot profileallows the inner cam member 3300 to extend distally at a constant ratewhile rotating about 180 degrees.

Referring to FIG. 34, the inner cam member 3400 has a proximal portion3424, an intermediate portion 3418, and a distal portion 3432. Thedistal portion 3432 of the inner cam member 3400 has a serrated cuttingsurface 3412. The inner cam member 3400 also has a cam slot 3416 havingclosed configuration with a generally sinusoidal profile. The cam slot3416 surrounds about half the circumference of the intermediate portion3418 of the inner cam member 3400. Accordingly, the closed cam slotprofile allows the inner cam member 3300 to extend distally at agenerally constant rate and retract proximally at a generally constantrate while rotating about 180 degrees. Unlike the inner cam member 3300of FIG. 33, which has a generally linear profile and only allows forextension during 180 degrees of rotation, the sinusoidal profile of thecam slot 3414 of the inner cam member 3400 of FIG. 34 allows for bothextension and retraction over 180 degrees of rotation while providingfor a smooth transition between the extension and retraction. That is,the inner cam member 3400 extends while rotating about 90 degrees, andthen retracts for the next 90 degrees of rotation in the same direction.

Referring to FIG. 35, the inner cam member 3500 has a proximal portion3524, an intermediate portion 3518, and a distal portion 3532. Thedistal portion 3532 of the inner cam member 3500 has a serrated cuttingsurface 3512. The inner cam member 3500 also has a cam slot 3516 havingclosed configuration with a generally “V” shaped profile. The cam slot3516 surrounds about half the circumference of the intermediate portion3518 of the inner cam member 3400. Accordingly, the closed cam slotprofile allows the inner cam member 3500 to extend distally at agenerally constant rate and retract proximally at a generally constantrate while rotating about 180 degrees. Similar to the inner cam member3400 of FIG. 34, which has a generally sinusoidal profile, the “V”shaped profile of the cam slot 3514 of the inner cam member 3500 of FIG.35 allows for both extension and retraction over 180 degrees ofrotation. However, the “V” shaped profile of the cam slot 3514 has asharper profile, and thereby creating a faster transition from extensionto retraction at about the 90 degree transition point.

Referring to FIG. 36, the inner cam member 3600 has a proximal portion3624, an intermediate portion 3618, and a distal portion 3632. Thedistal portion 3632 of the inner cam member 3600 has a serrated cuttingsurface 3612. The inner cam member 3600 also has a cam slot 3616 havinga closed configuration with a generally linear profile. The cam slot3616 surrounds almost the entire circumference of the intermediateportion 3618 of the inner cam member 3600. That is, the cam slot 3616 isincluded in about 360 degrees of the circumference of the intermediateportion 3618 of the inner cam member 3600. In comparison to FIG. 33,which includes an inner cam member 3300 having a generally linearlyshaped cam slot 3316 with a closed configuration surrounding about halfthe circumference of the intermediate portion 3318 of the inner cammember 3300, the inner cam member 3600 of FIG. 36 has a generallylinearly shaped cam slot 3616 with closed configuration surroundingalmost the entire circumference of the intermediate portion 3618 of theinner cam member 3600. Accordingly, the cutting surface 3612 of theinner cam member 3600 may extend (and/or retract) a greater distanceand/or extend (and/or retract) at a slower rate in comparison to thecutting surface 3312 of the inner cam member 3300 because the cam slot3616 of the inner cam member 3600 of FIG. 36 is longer than the cam slot3316 of the inner cam member 3300 of FIG. 33.

Referring to FIG. 37, the inner cam member 3700 has a proximal portion3724, an intermediate portion 3718, and a distal portion 3732. Thedistal portion 3732 of the inner cam member 3700 has a serrated cuttingsurface 3712. The inner cam member 3700 also has a cam slot 3716 havingclosed configuration with a generally sinusoidal profile. The cam slot3716 surrounds almost the entire circumference of the intermediateportion 3718 of the inner cam member 3700. That is, the cam slot 3716 isincluded slightly less than 360 degrees around the circumference of theintermediate portion 3718 of the inner cam member 3700. In comparison toFIG. 34, which includes an inner cam member 3400 having a generallysinusoidal shaped cam slot 3416 with a closed configuration surroundingabout half the circumference of the intermediate portion 3418 of theinner cam member 3400, the inner cam member 3700 of FIG. 37 has agenerally sinusoidal shaped cam slot 3716 with closed configurationsurrounding almost the entire circumference of the intermediate portion3718 of the inner cam member 3700. Accordingly, the cutting surface 3712of the inner cam member 3700 may extend and retract a greater distanceand/or extend and retract a slower rate in comparison to the cuttingsurface 3412 of the inner cam member 3400 because the cam slot 3716 ofthe inner cam member 3700 of FIG. 37 is longer than the cam slot 3416 ofthe inner cam member 3400 of FIG. 34.

Referring to FIG. 38, the inner cam member 3800 has a proximal portion3824, an intermediate portion 3818, and a distal portion 3832. Thedistal portion 3832 of the inner cam member 3800 has a serrated cuttingsurface 3812. The inner cam member 3800 also has a cam slot 3816 havingclosed configuration with a generally “V” shaped profile. The cam slot3816 surrounds almost the entire circumference of the intermediateportion 3818 of the inner cam member 3800. That is, the cam slot 3816 isincluded slightly less than 360 degrees around the circumference of theintermediate portion 3818 of the inner cam member 3800. In comparison toFIG. 35, which includes an inner cam member 3500 having a generally “V”shaped cam slot 3516 with a closed configuration surrounding about halfthe circumference of the intermediate portion 3518 of the inner cammember 3500, the inner cam member 3800 of FIG. 38 has a generally “V”shaped cam slot 3816 with closed configuration surrounding almost theentire circumference of the intermediate portion 3818 of the inner cammember 3800. Accordingly, the cutting surface 3812 of the inner cammember 3800 may extend and retract a greater distance and/or extend andretract a slower rate in comparison to the cutting surface 3512 of theinner cam member 3500 because the cam slot 3816 of the inner cam member3800 of FIG. 38 is longer than the cam slot 3516 of the inner cam member3500 of FIG. 35.

As previously discussed with respect to FIG. 4, the distal end of theflexible outer sheath 404 may be smooth and evenly rounded at its mostdistal point. Alternatively, the distal end of the outer sheath may notbe smooth. Rather, the distal end of the outer sheath may be uneven inorder to increase the outer sheath's ability to engage tissue. Byengaging tissue, the outer sheath may increase its ability to remainstationary within the subject's vascular system as the inner cam memberand blade rotate and extend into such tissue, thereby potentiallyminimizing undesirable rotation and/or movement of the outer sheath orsurgical device.

FIGS. 29A, 29B, 29C and 29D depict a distal tip 2900 of the outer sheathaccording to an embodiment of the disclosure. The distal tip 2900illustrated in these figures is depicted as a separate component. Thoseof skill in the art will understand how to make and use the disclosedaspects, embodiments, and/or configurations of the distal tip afterunderstanding the present disclosure to adjust the location, size,configuration and/or type of indicator. For example, the distal tip,particularly its uneven configuration, may be created in the distalportion of the outer sheath, the outer cam member and/or combination ofthe outer sheath and outer cam member. All such configurations withinthe knowledge of one skilled in the art are considered within the scopeof this disclosure. For the purposes of this disclosure, the “distaltip,” particularly the distal tip of the outer sheath, shall mean andinclude a separate component attached to the outer sheath, the distalportion of the outer sheath, the outer cam member located at the distalend of the sheath, a combination of any of the preceding, and/or anyother distal portion or component of the surgical device intended tocontact tissue.

Continuing to refer to FIGS. 29A-29D, distal tip 2900 has a proximal end2908 and a distal end 2912. The proximal end 2908 of the distal tip 2900extends from or is attached to the outer sheath, the outer cam member,etc., and/or a combination thereof. The distal tip 2900 also includes aplurality of notches 2904 extending proximally from its distal end 2912.The notches 2904 create an uneven profile at the distal end 2912 of thedistal tip, and this uneven profile facilitates the distal tip'sengagement with the tissue or other material within the subject'svasculature, thereby holding the outer sheath stationary while the bladerotates and extends into the tissue.

FIGS. 29A-29D depicts six notches 2904 that have a generally rectangularshape that taper upwardly from the distal end 2904 toward the proximalend 2908 until the notches intersect and become flush with the exteriorsurface of the distal tip 2900. The notches 2904 are formed by removingmaterial from the distal end 2904 of the distal tip. Notches may also beformed by adding material at predetermined intervals along the perimeterof the distal tip, such that the notches are created and located betweenthe additional materials. Depending upon the size and configuration ofthe surgical device, particularly its distal tip, those of skill in theart will understand how to make and use the disclosed aspects,embodiments, and/or configurations after understanding the presentdisclosure to adjust the number, location, size, configuration and/ortype of notches. All such notch configurations within the knowledge ofone skilled in the art are considered within the scope of thisdisclosure.

With reference to FIGS. 30A-30D there is depicted an alternativeexemplary distal tip 3000 has a proximal end 3008 and a distal end 3012.The notches 3104 included within this distal tip 3000 have a generallynarrower rectangular shape in comparison to the notches 2904 of distaltip 2900 depicted in FIGS. 29A-29D. Due to the narrower configuration ofthe notches 3014 illustrated in FIGS. 30A-30D, the distal tip 3000includes three times as many notches, for a total of eighteen, incomparison to the number of notches 2904 in distal tip 2900. AlthoughFIGS. 29A-D and FIGS. 30A-D depict rectangular shaped notches 2904,3004, the distal tip may include notches of any desirable shape thatwill engage tissue, including but not limited to any variation of asquare, rhombus, parallelogram, trapezoid, triangle, circle, ellipse,kite, etc. For example, FIGS. 31A-31D depict a further alternativeexemplary distal tip 3100 having V-shaped notches 3104 extending fromdistal end 3112 toward proximal end 3108.

The notches 2904, 3004, and 3104 included in distal tips 2900, 3000, and3100, respectively, are configured to engage tissue and to prevent theouter sheath from rotating as the blade rotates and extends into suchtissue. Inclusion of the notches in the outer sheath may also enhancethe surgical devices ability to cut tissue because the combination ofnotches within the distal tip and notches within the cutting surface ofthe inner cam member may create a shearing force, thereby increasing theoverall amount of cutting force applied to the tissue. Accordingly, thenotches of the distal tip may also be configured to include a sharpblade profile, such as the serrated and notched blades depicted in FIGS.9, 11, 12 and 13 and any equivalents thereof.

With reference to FIGS. 32A and 32B, there is depicted a distal tip 3202and an inner cam member 3208. The inner cam member 3208 has a pluralityof notches 3212 creating a serrated-type blade, and distal tip 3202 hasa plurality of notches 3204 that have a substantially similar size andshape as the notches 3212 within the inner cam member 3208. FIG. 32Adepicts the inner cam member 3208 in a retracted position because thecutting surface does not extend beyond the distal end of the distal tip.When the inner cam member 3208 is in its distal portion, it may bepreferable that the notches 3204, 3212 of the inner cam member 3208 andthe distal tip 3202 substantially align in order to improve the surgicaldevice's ability, particularly the distal tip's ability, to engagetissue. Referring to FIG. 32B, as the inner cam member 3208 begins torotate and extend outwardly from its retracted position, the serrations3216 begin to pass over the notches 3204 in the distal tip 3202, therebycreating a shearing force against the tissue and potentially increasingthe device's cutting ability.

With reference to FIG. 24, there is a depicted an alternative embodimentof surgical device 2400 that comprises and indicator 2440 indicative ofhow far the blade of the inner cam member has traveled and/or hastraveled beyond the distal end of the outer sheath. The indicator 2440in FIG. 24 is located on the top of the distal portion of the handle2404. Specifically, the indicator 2440 is located between the distal endof the handle 2404 and a vertically extending portion 2438 of the handlethat encases components, such as gears, within the handle 2404.Indicator 2440 may include indicia, such as numbers or dimensionindicative of the length that the blade has traveled and/or has traveledbeyond the distal end of the outer sheath. In addition and/or in lieu ofthe indicia, the indicator 2440 may include color coded regions (e.g.,green, yellow, orange, red, etc.), such that differently colored regionsconvey to the clinician whether it is more or less safe to move theentire surgical device, including the sheaths, within the patient'svasculature depending upon whether the cutting blade is exposed and/orhow much of it is exposed. The indicator 2440 may also be directlyand/or indirectly connected to the actuating means of the surgicaldevice.

Although the indicator 2440 in FIG. 24 is located on the top of thedistal portion of the handle 2404, FIG. 24 is not intended to representthe only location and type of indicator that may be included in aserrated cutting surface. Depending upon the size and configuration ofthe surgical device, particularly its handle and actuating mechanism(s),those of skill in the art will understand how to make and use thedisclosed aspects, embodiments, and/or configurations afterunderstanding the present disclosure to adjust the location, size,configuration and/or type of indicator. All such configurations withinthe knowledge of one skilled in the art are considered within the scopeof this disclosure. For example, referring to FIG. 25, an alternativeexemplary surgical device 2500 comprising an indicator 2540 depicted onthe proximal, top portion of handle 2504. Also, referring to FIG. 26, analternative exemplary surgical device 2600 comprising an indicator 2640depicted on the side of the handle 2640, particularly, the indicator2640 is located on a vertically extending portion 2638 of the handle2604 that encases components, such as gears. The indicator also does notneed to be mechanically actuated indicator. For example, if a motor isused to actuate the sheath, the indicator can be color-coded light, orother type of electrically based indicators, located on the top of thehandle as depicted with reference to FIG. 27. Additionally, the color(e.g., green, yellow, orange, red, etc.) of the light, the brightness ofthe light and/or whether light remains constant or blinks (including thefrequency of blinking) may change as the blade travels from itsretracted position to its extended position.

Additionally, the indicator need not be located on the surgical deviceor any portion thereof, such as the handle. Rather, the indicator can belocated external to the surgical device. That is, the surgical devicemay include a communication port that transmits the indictor signal(s)to a remote display and/or a remote device. For example, the surgicaldevice may be connected to a remote fluoroscopy monitor, either via acable or wirelessly, thereby allowing the monitor to display theposition of the cutting surface (i.e., blade), inner cam, inner sheathand/or any other component of the surgical device. Transmitting thedevice's positional information to the monitor potentially allows theclinician to view the position of the blade on the same monitor that theclinician is using to perform the surgical procedure while navigatingthe patient's vasculature.

Referring to FIGS. 40A and 40B, there is depicted an illustration of anembodiment of the distal end 4000 of the inner sheath and the outersheath. The component of the inner sheath depicted in these figures isthe inner cam member. The inner cam member, as depicted, has a cuttingsurface 4008 as well as an optional circular hollow inner member 4012located within the lumen of the cutting blade. The component of theouter sheath depicted in these figures is the outer cam member 4004. Asdiscussed hereinbefore, the outer cam member 4004 has a distal portion4020. The circular hollow inner member may be integral with the innercam or it may be a separate component. If the circular hollow innermember is a separate component it may be affixed or coupled to the innercam member at a location proximal of the distal end. The most distalregion of the distal portion 4020 of the outer cam member 4004 may bereferred to as a distal end region 4016. The distal end region 4016 istapered, and the taper may be linearly, curved and/or radially shaped.

The outer cam member 4004 has a wall thickness, and the wall thicknessdepicted in FIGS. 40A and 40B is consistent around the entirecircumference of the outer cam member 4004 for a given cross section.That is, even though the wall thickness is thinner and decreases at thedistal end region 4016 of the outer cam member in comparison to the wallthickness for a more proximal portion of the distal portion 4020, thewall thickness is the same or substantially the same at any point aroundthe cross-section of the outer cam member 4004. As discussed herein, theouter cam member 4004 shields the blade, particularly the cuttingsurface 4008, from the vasculature when the blade is retracted. Theouter cam member 4004 also creates a distance between the cuttingsurface 4008 and the vasculature when the blade is extended. And as thewall thickness of the outer cam member 4004 increases, so does thedistance between the blade and the vasculature.

The circular hollow inner member 4012 has a wall thickness, and the wallthickness depicted in FIGS. 40A and 40B is consistent around the entirecircumference of the circular hollow inner member 4012 for a given crosssection. That is, if the wall thickness is thinner and decreases at thedistal end of the circular hollow inner member 4012 in comparison to thewall thickness for the more proximal portion of the circular hollowinner member 4012, the wall thickness is the same or substantially thesame at any point around the cross-section of the circular hollow innermember 4012. The circular hollow inner member 4012 acts to guide thelead during introduction into the lumen(s) of the inner and outersheaths. The circular hollow inner member 4012 also acts to direct thelead toward the center of the lumen of the inner cam member and awayfrom the cutting surface 4008. And as the wall thickness of the circularhollow inner member 4012 increases, the lead is more likely to belocated at the center of the lumen of the inner cam member and furtheraway from the blade. This may be helpful during extension (orretraction) of the blade and cutting surface 4008, thereby potentiallyreducing the likelihood of the cutting surface 4008 cutting the leadduring extension.

Referring to FIGS. 41A and 41B, there is depicted an illustration of anembodiment of the distal end 4100 of the inner sheath and the outersheath. The component of the inner sheath depicted in these figures isthe inner cam member. The inner cam member, as depicted, has a cuttingsurface 4108 as well as an optional circular hollow inner member 4112located within the lumen of the cutting blade. The component of theouter sheath depicted in these figures is the outer cam member 4104. Theouter cam member 4104 has a distal portion, and the most distal regionof the distal portion of the outer cam member 4004 may be referred to asa distal end region 4116. The distal end region 4116 is tapered, and thetaper may be linearly, curved and/or radially shaped.

Unlike the wall thickness of the outer cam member 4014 in FIGS. 40A and40B, the outer wall thickness of the outer cam 4104 in FIGS. 41A and 41Bis not uniform around the circumference for a given cross section of theouter cam member 4104. That is, the wall thickness is less or thinner ata portion 4120 of the cross section of the outer cam member 4104 incomparison to another portion 4124 for the same cross section. In otherwords, the wall thickness is greater or thicker at a portion 4124 of thecross section of the outer cam member 4104 in comparison to anotherportion 4120 for the same cross section.

It may be desirable for the outer cam member 4104 and/or other portionsof the outer sheath to have a non-uniform wall thickness for a givencross section such that the distance between the blade 4108 and theexterior of the outer cam member 4104 is greater at one or more portionsalong the circumference at a particular cross section in comparison tothe other portion(s) of the cross section. Increasing thecross-sectional wall thickness for one or more portions of the outersheath, particularly at the distal portion and the distal end region4116 of the outer cam member 4104, assists in shielding the vasculaturefrom the blade 4108 during extension because the increased wallthickness creates a greater distance between the vasculature and theblade in comparison to the remainder of the cross section. Andincreasing the wall thickness of a portion of the circumference of thecross section of the outer cam member 4104 may allow the clinician toorient the sheaths in particular radial direction in a safer mannerwhile navigating the patient's vasculature. For example, it may bebeneficial for the increased wall thickness of the outer cam 4104 to beadjacent the exterior of a curved section of vasculature in comparisonto the interior curved section of the vasculature to further minimizethe likelihood of inadvertent contact from the blade.

Continuing to refer to FIGS. 41A and 41B, thicker and thinner portions(or segments) of the outer cam member 4104 may be adjacent and/oropposite one another along a cross section of a circumference of theouter cam member 4104. As illustrated in these figures, the exterior ofthe outer cam member 4104 is designed such that the thicker and thinnercross-sectional portions transitions to and from one another withoutinterruption along the exterior surface of the outer cam member, therebycreating a smooth and unpronounced transition between a thicker wallportion and thinner wall portion. Unlike the cross section of the outercam member 4104, the circular hollow inner member 4112 illustrated inFIGS. 41A and 41B has a wall thickness that is consistent around theentire circumference of the circular hollow inner member 4112 for agiven cross section and is, therefor, similar to the circular hollowinner member 4012 discussed hereinbefore with respect to FIGS. 40A and40B.

Referring to FIGS. 42A and 42B, there is depicted an illustration of anembodiment of the distal end 4200 of the inner sheath and the outersheath. The component of the inner sheath depicted in these figures isthe inner cam member. The inner cam member, as depicted, has a cuttingsurface 4208 and a circular hollow inner member 4212 located within thelumen of the cutting blade. The component of the outer sheath depictedin these figures is the outer cam member 4204. The outer cam member 4204has a distal portion 4020, which has a distal end region 4216. Thedistal end region 4216 is tapered, and the taper may be linearly, curvedand/or radially shaped. The outer cam member 4204 illustrated in FIGS.42A and 42B has a wall thickness that is consistent around the entirecircumference of the outer cam member 4204 for a given cross section andis, therefore, similar to the outer cam member 4204 discussedhereinbefore with respect to FIGS. 40A and 40B.

The circular hollow inner member 4212 has a wall thickness. Unlike wallthickness of the circular hollow inner member 4012 in FIGS. 40A and 40B,the thickness of the circular hollow inner member 4212 in FIGS. 42A and42B is not uniform around the circumference for a given cross section.That is, the wall thickness is thinner at a portion 4232 of the crosssection of the circular hollow inner member 4212 in comparison toanother portion 4228 for the same cross section. In other words, thewall thickness is greater at a portion 4228 of the cross section of thecircular hollow inner member 4212 in comparison to another portion 4232for the same cross section. State differently, the wall thickness if thecircular hollow inner member 4212 is non-uniform between its exteriorsurface, which is adjacent the cutting blade, and its interior surface,which creates the lumen therethrough. Increasing the wall thickness fora portion of the circular hollow inner member 4212 guides the lead awayfrom that portion of the inner cam member 4204 and towards the center ofthe lumen, thereby decreasing the likelihood that the cutting surface4208 will cut the lead upon lead entry and/or upon extension of thecutting blade.

As illustrated in these figures, the interior surface and exteriorsurface of the circular hollow inner member is designed such that thethicker and thinner cross-sectional portions transitions to and from oneanother without the interruption along either the interior or theexterior surface of the circular hollow inner member, thereby creating asmooth and unpronounced transition between a thicker wall portion andthinner wall portion.

The increased wall thickness for a portion of the circular hollow innermember 4212 may be in conjunction with an outer cam member 4204 having awall thickness that is consistent around the entire circumference for agiven cross section as illustrated in FIGS. 42A and 42B. And theincreased wall thickness for a portion of the circular hollow innermember 4312 may be in conjunction with an outer cam member 4304 having awall thickness that is non uniform for a given cross section asillustrated in FIGS. 43A and 43B. Continuing to refer to FIGS. 43A and43B, there is depicted an illustration of an embodiment of the distalend 4300 of the inner sheath and the outer sheath. The inner sheathincludes the inner cam member. The inner cam member, as depicted, has acutting surface 4308 as well as a circular hollow inner member 4312located within the lumen of the cutting blade. The outer sheath includesthe outer cam member 4304. The outer cam member 4304 has a distalportion, and the most distal region of the distal portion of the outercam member 4304 may be referred to as a distal end region 4316.

The outer wall thickness of the outer cam 4304 in FIGS. 43A and 43B isnot uniform around the circumference for a given cross section of theouter cam member 4304. That is, the wall thickness is thinner at aportion 4320 of the cross section of the outer cam member 4304 incomparison to another portion 4324 for the same cross section. In otherwords, the wall thickness is greater at a portion 4324 of the crosssection of the outer cam member 4304 in comparison to another portion4320 for the same cross section.

The thickness of the circular hollow inner member 4312 is not uniformaround the circumference for a given cross section. That is, the wallthickness is thinner at a portion 4332 of the cross section of thecircular hollow inner member 4312 in comparison to another portion 4228for the same cross section. In other words, the wall thickness isgreater at a portion 4324 of the cross section of the circular hollowinner member 4312 in comparison to another portion 4332 for the samecross section. Increasing both the wall thickness of the outer cammember 4304 and the wall thickness for a portion of the circular hollowinner member 4312 assists in both shielding the vasculature from theblade 4308 during extension and guides the lead away from that portionof the inner cam member and towards the center of the lumen, therebydecreasing the likelihood that the cutting surface 4308 will either cutthe lead upon lead entry (and/or upon extension of the cutting blade) orupon contact the tissue upon blade extension.

FIGS. 43A and 43B depict the increased portion 4328 of circular hollowinner member 4312 and the increased portion 4324 of the outer cam member4304 as being radially aligned. However, the increased portions of thecircular hollow inner member 4312 and the outer cam member 4304 need notbe radially aligned and may be radially offset from one another. Forexample, the increased portions of the circular hollow inner member 4312and the outer cam member 4304 may be radially offset from one anotherbetween 1 degree and 359 degrees.

Both the circular hollow inner member 4312 and the outer cam member 4304may have a plurality of increased portions that are evenly or unevenlyoffset from one another. For example, referring to FIG. 44B, there is adepicted an outer cam member 4404 having a non-uniform thickness thatincludes two increased portions 4424, 4426 that are 180 degrees offsetfrom one another, thereby creating an oval shaped cross-sectionalprofile of the distal end of the outer cam member 4404 viewed from thedistal end thereof. Although it is not illustrated in the figures, theouter cam member may include three increased portions separated about120 degrees from one another. Additionally, the outer cam member mayinclude four increased portions separated about 90 degrees from oneanother. Again, the increased portions, however, do not have to beradially opposed from one another and may be offset from one another atany angle.

Although FIGS. 44A and 44B illustrate the circular hollow inner member4412 as having a uniform wall thickness, the circular hollow member 4412may have a non-uniform wall thickness that includes one or moreincreased portions. For instance, the circular hollow inner member 4412may have two increased portions that radially align with the twoincreased portions 4424, 4426 of the outer cam member. Alternatively,the circular hollow inner member 4412 may have two increased portionsthat are offset from the two increased portions 4424, 4426 of the outercam member by 90 degrees or any other angle.

In order to assist the clinician using the surgical device to know wherethe one or more increased portions of the outer cam member and/or thecircular hollow inner member, the surgical device may include indicatorson the handle and/or the proximal end of the outer sheath thatcorrespond to the radial position of the increased portions. Forexample, the indicators may include those described in commonly ownedU.S. patent application Ser. No. 14/195,692 filed Mar. 3, 2014, entitled“Dilator Sheath Set”, which is hereby incorporated herein by referencein its entirety for all that it teaches and for all purposes.

Referring to FIG. 45, there is depicted an alternate embodiment of asurgical device 4500 having a housing 4510, an inner and outer sheath4508 extending therefrom, a handle 4508, wherein the handle includes atrigger 4512 that is manually moveable in a linear (e.g., proximally anddistally) direction. Referring to FIGS. 45A and 45B, a rotary actuatorcomprising a linear slide is included within the housing 4510. A linearslide may also be referred to as a linear-motion bearing. A linear slideis a bearing designed to provide motion in a particular direction ordimension. For the purposes of this disclosure, the rotary actuatorconverts linear motion to rotary motion. Accordingly, the linear slideis used to convert rotary motion from linear motion. There are varioustypes of rotary actuators other than that discussed with respect toFIGS. 45A and 45B, and this disclosure is not intended to be limited tothe rotary actuator described in these two figures. The rotary actuatordescribed in these two figures includes a drive nut and leadscrewassembly. For example, the assembly includes a threaded nut 4520, whichis disposed within the trigger 4512, and a rotatable threaded shaft4516. At least a portion of the rotatable shaft 4516 is also threaded tomatingly engage with the threaded nut 4512 when the rotatable shaft 4516is disposed within the threaded lumen of the nut 4512. Upon linearactuation of the trigger 4512 in a proximal direction, the threaded nut4520 also moves proximally. Because the threads of the rotatable shaft4516 engage the threaded nut 4512, the shaft 4516 rotates as thethreaded nut 4520 and trigger 4512 translate proximally. The shaft 4516is coupled to the inner sheath, which in turn is coupled to the innercam member. Accordingly, upon linear actuation of the trigger 4512, theinner cam member rotates and extends distally and/or retractsproximally, as discussed hereinbefore.

As mentioned above, this disclosure is not limited to the embodiment ofthe rotary actuator and/or the linear slide discussed with respect toFIGS. 45A and 45B. For example, other rotary actuators may include alinear slide embodiment having a nut or other object having a threadedinner lumen and a shaft having one or more series of mating keys (orpins) on its exterior that act as a follower, thereby imparting rotationto the shaft upon linear movement by the nut or other object.Alternatively, the exterior of the shaft may be threaded and the nut mayhave either a one or more series of mating keys (or pins) on or in itslumen that follow the thread on the shaft and impart rotation to theshaft. Furthermore, the rotary actuator may include a linear slidecomprising a rolling ring bearing (or an assembly of a plurality ofrolling ring bearings) and an unthreaded shaft.

A tension spring and/or a compression spring are also included withinthe housing and connected to the trigger 4512 and/or shaft 4516. Uponthe clinician's release of the trigger 4512, the tension spring and/orcompression spring force the trigger 4512 and nut 4520 to move distallyand return to their original position. As the trigger 4512 and nut 4520translate distally, the shaft 4516 rotates in the opposite direction,and the inner cam member rotates and extends distally and/or retractsproximally. The rotary actuator and/or linear slide, as describedherein, provides a smooth actuation and cooperation between the triggerand inner sheath.

In the appended figures, similar components and/or features may have thesame reference label. Further, various components of the same type maybe distinguished by following the reference label by a letter thatdistinguishes among the similar components. If only the first referencelabel is used in the specification, the description is applicable to anyone of the similar components having the same first reference labelirrespective of the second reference label.

Presented herein are embodiments of a tissue separating device, system,and method. As described herein, the device(s) may be electrical,mechanical, electro-mechanical, and/or combination thereof.

A number of variations and modifications of the disclosure may be used.It would be possible to provide for some features of the disclosurewithout providing others.

In some embodiments, the systems and methods of this disclosure may beimplemented in conjunction with a special purpose computer, a programmedmicroprocessor or microcontroller and peripheral integrated circuitelement(s), an ASIC or other integrated circuit, a digital signalprocessor, a hard-wired electronic or logic circuit such as discreteelement circuit, a programmable logic device or gate array such as PLD,PLA, FPGA, PAL, special purpose computer, any comparable means, or thelike. In general, any device(s) or means capable of implementing themethodology illustrated herein may be used to implement the variousaspects of this disclosure. Exemplary hardware that may be used for thedisclosed embodiments, configurations and aspects includes computers,handheld devices, telephones (e.g., cellular, Internet enabled, digital,analog, hybrids, and others), and other hardware known in the art. Someof these devices include processors (e.g., a single or multiplemicroprocessors), memory, nonvolatile storage, input devices, and outputdevices. Furthermore, alternative software implementations including,but not limited to, distributed processing or component/objectdistributed processing, parallel processing, or virtual machineprocessing may also be constructed to implement the methods describedherein.

The present disclosure, in various aspects, embodiments, and/orconfigurations, includes components, methods, processes, systems and/orapparatus substantially as depicted and described herein, includingvarious aspects, embodiments, configurations embodiments, subcombinations, and/or subsets thereof. Those of skill in the art willunderstand how to make and use the disclosed aspects, embodiments,and/or configurations after understanding the present disclosure. Thepresent disclosure, in various aspects, embodiments, and/orconfigurations, includes providing devices and processes in the absenceof items not depicted and/or described herein or in various aspects,embodiments, and/or configurations hereof, including in the absence ofsuch items as may have been used in previous devices or processes, e.g.,for improving performance, achieving ease and/or reducing cost ofimplementation.

For example, the disclosure discusses two sheaths—and inner sheath andan outer sheath. Additionally, the disclosure discusses using two cammembers—an outer stationary cam member and an inner telescopically,rotatable cam member. With preference to FIG. 28, it may be beneficialto use additional rotatable sheaths, stationary sheaths, stationary cammembers and/or rotatable cam members. FIG. 28 depicts an alternateexemplary embodiment of the distal portion of the sheaths. This figureillustrates a flexible stationary outer sheath 2816, a flexibleextendable intermediate sheath 2804, and a flexible extendable innersheath 2826. Coupled to the outer sheath 2816 is a rotatable outer cammember 2826. Coupled to the intermediate sheath 2804 is a rotatableintermediate cam member 2808. Coupled to the inner sheath 2826 is arotatable inner cam member 2812. The inner cam member 2812 is connectedto the intermediate cam member 2808 by pin 2810. The intermediate cammember 2808 is connected to the outer cam member by pin 2824. As theinner sheath 2826 extends distally, the inner cam member rotates andtravels according to the profile of cam slot 2830 in which the pin 2810sits. Similarly, as the intermediate sheath 2804 extends distally, theintermediate cam member rotates and travels according to the profile ofthe cam slot 2834 in which the pin 2824 sits. Utilizing multiplerotatable and extendable sheaths, as well as rotatable cam members,allows the device to increase the extension and rotation of the cuttingsurface. This is only one example of an alternative embodiment, anddepending upon the amount of blade extension and/or desired rotationand/or movement of the cutting blade, those of skill in the art willunderstand how to make and use the disclosed aspects, embodiments,and/or configurations after understanding the present disclosure toadjust the location, size, configuration and/or type of indicator. Allsuch configurations within the knowledge of one skilled in the art areconsidered within the scope of this disclosure.

Additionally, various types of cams, such as single lobe cams and doublelobe cams are discussed within this disclosure. Other lobe camconfigurations, such as triple lobe cams, may be used. Similar, theincrement of the additional length of cam slot need not be 90 degreesbeyond 360 degrees. For example, the additional length of cam slot canbe in increments of 5, 10, 15, 30, 45, 60 degrees, etc. Furthermore,although the slope of the cam slot between two positions and/or pointshas been described as generally linear, the slope between two pointsneed not be linear. Rather, the cam slot and/or slope of the cam slotcan be non-linear, such as a sinusoidal shape, which may or may not havea generally linear portion. The sinusoidal shape, particularly at thetransition points allows for a smooth transition of the inner cammember, inner sheath, and/or cutting surface from an extended directionto retracted direction through such positions while maintaining arelatively constant rate of rotation, thereby allowing the cuttingsurface to continue to rotate and cut the tissue through suchtransition.

Moreover, although a pin and slot cam configuration is discussed withinthis disclosure, other possible cam configurations may be used. Forexample, a captured ring cam configuration may be used. A captured ringcam configuration may include a ring that is attached to at least one ofthe inner sheath (or inner member attached to the inner sheath) or theouter sheath (or outer member attached to the outer sheath) and that iscaptured by two angled lobes on the other sheath (or member). Althoughthe ring may be captured by one lobe, it may be preferred for the ringto be captured by two lobes—one on each side of the ring—such thatcutting surface may be forced in both a proximal direction (toward aretraction position) and distal direction (toward an extendeddirection). The benefit of being able to force the cutting surface inboth directions with the aid of the captured cam configurationpotentially negates the need for a spring or other retraction mechanismto force the inner sheath (or inner member) and cutting surface backwithin the outer sheath (or outer member.

The foregoing discussion has been presented for purposes of illustrationand description. The foregoing is not intended to limit the disclosureto the form or forms disclosed herein. In the foregoing Summary forexample, various features of the disclosure are grouped together in oneor more aspects, embodiments, and/or configurations for the purpose ofstreamlining the disclosure. The features of the aspects, embodiments,and/or configurations of the disclosure may be combined in alternateaspects, embodiments, and/or configurations other than those discussedabove. This method of disclosure is not to be interpreted as reflectingan intention that the claims require more features than are expresslyrecited in each claim. Rather, as the following claims reflect,inventive aspects lie in less than all features of a single foregoingdisclosed aspect, embodiment, and/or configuration. Thus, the followingclaims are hereby incorporated into this Detailed Description, with eachclaim standing on its own as a separate preferred embodiment of thedisclosure.

Moreover, though the description has included description of one or moreaspects, embodiments, and/or configurations and certain variations andmodifications, other variations, combinations, and modifications arewithin the scope of the disclosure, e.g., as may be within the skill andknowledge of those in the art, after understanding the presentdisclosure. It is intended to obtain rights which include alternativeaspects, embodiments, and/or configurations to the extent permitted,including alternate, interchangeable and/or equivalent structures,functions, ranges or steps to those claimed, whether or not suchalternate, interchangeable and/or equivalent structures, functions,ranges or steps are disclosed herein, and without intending to publiclydedicate any patentable subject matter.

What is claimed is: 1-16. (canceled)
 17. A device for removing animplanted object from a body vessel, the device comprising: a handle; atrigger movably coupled to the handle; an elongated sheath extendingfrom the handle, the elongated sheath comprising a lumen extendingtherethrough, wherein the lumen is configured to receive an implantedobject, the elongated sheath further comprising a proximal portion and adistal portion; a tubular outer member attached to the distal portion ofthe elongated sheath,; a pin attached to the tubular outer member andextending inwardly thereof; a tubular inner member located within thetubular outer member, the tubular inner member comprising a proximalend, a distal end and an exterior surface therebetween, the distal endcomprising a cutting surface, the exterior surface of the tubular innermember comprising a cam slot for receipt of and cooperation with the pinsuch that upon actuation of the handle, the tubular inner member rotatesand the distal end of the tubular inner member extends distally beyondthe tubular outer member; and a rotary actuator disposed within thehandle, the rotary actuator comprising a linear motion bearing coupledto the trigger, the linear motion bearing surrounding a shaft, whereinthe shaft is coupled to the tubular inner member, such that uponnon-pivoting movement of the trigger relative to the handle, the tubularinner member rotates.
 18. The device of claim 17, wherein the linearmotion bearing comprises a nut and leadscrew assembly, wherein theleadscrew surrounds the shaft.
 19. The device of claim 18, wherein theshaft comprises an exterior surface, wherein at least a portion of theexterior surface is threaded, and wherein the nut comprises a threadedportion and the threaded portion of the exterior of the shaft matinglyengages with the threaded portion of the nut.
 20. The device of claim17, wherein the linear motion bearing comprises a rolling ring bearingand an unthreaded shaft.
 21. The device of claim 17, wherein at leastone portion of the tubular outer member has a non-uniformcircumferential wall thickness.
 22. The device of claim 21, wherein thenon-uniform circumferential wall thickness comprises a first segment anda second segment, wherein the first segment has a thickness greater thanthe second segment.
 23. The device of claim 22, wherein the firstsegment is disposed opposite the second segment along a cross section ofa circumference of the tubular outer member.
 24. The device of claim 22,wherein the tubular outer member comprises an outer surface, and whereinthe first segment transitions to the second segment without interruptionon the outer surface.
 25. The device of claim 22, wherein at least oneof the handle and the elongated sheath comprise an indicator indicativeof a location of at least one of the first segment and the secondsegment.
 26. The device of claim 21, wherein the tubular outer memberhas a proximal end portion and a distal end portion, wherein the atleast one portion of the tubular outer member having the non-uniformcircumferential wall thickness is located at least at the distal endportion.
 27. The device of claim 26, wherein the at least one portion ofthe tubular outer member having the non-uniform circumferential wallthickness comprises a first segment having a thickness greater than asecond segment.
 28. The device of claim 26, wherein the at least oneportion of the tubular outer member having the non-uniformcircumferential wall thickness comprises a first segment, a secondsegment, and a third segment, wherein the first segment and the secondsegment have a thickness greater than the third segment.
 29. The deviceof claim 28, further comprising a third tubular member located withinthe tubular inner member, wherein at least one portion of the thirdtubular member has a non-uniform circumferential wall thickness.
 30. Thedevice of claim 29, wherein the non-uniform circumferential wallthickness of the third tubular member comprises a first segment and asecond segment, wherein the first segment has a thickness greater thanthe second segment.
 31. The device of claim 17, wherein the tubularinner member is a first tubular inner member, and further comprising asecond tubular inner member, wherein at least one portion of the secondtubular inner member has a non-uniform circumferential wall thickness.32. The device of claim 31, wherein the non-uniform circumferential wallthickness comprises a first segment and a second segment, wherein thefirst segment has a thickness greater than the second segment.
 33. Thedevice of claim 32, wherein the first segment is disposed opposite thesecond segment along a cross section of a circumference of the secondtubular inner member.
 34. A device for removing an implanted object froma body vessel, the device comprising: a handle; a trigger movablycoupled to the handle; an elongated sheath extending from the handle,the elongated sheath comprising a lumen extending therethrough, whereinthe lumen is configured to receive an implanted object, the elongatedsheath further comprising a proximal portion and a distal portion; atubular outer member attached to the distal portion of the elongatedsheath; a pin attached to the tubular outer member and extendinginwardly thereof; a tubular inner member located within the tubularouter member, the tubular inner member comprising a proximal end, adistal end and an exterior surface therebetween, the distal endcomprising a cutting surface, the exterior surface of the tubular innermember comprising a cam slot for receipt of and cooperation with the pinsuch that upon actuation of the handle, the tubular inner member rotatesand the distal end of the tubular inner member extends beyond thetubular outer member; and a linear-motion bearing coupled to the triggerand the tubular inner member, such that upon actuating the triggersolely in a linear direction, the tubular inner member rotates andextends or retracts relative to the tubular outer member.